Dr. Guillermo J. Vázquez

Professor
Dr Guillermo J Vazquez

Contact Info

  • guillermo.vazquez@upr.edu
  • Department.of Microbiology and Zoology
    University of Puerto Rico-School of Medicine,
    P.O. Box 365067,
    San Juan, P.R. 00936-5067
  • (787)758-2525 ext. 1309
    (787) 756-7110

Education

  • University of Puerto Rico, Pre-Medical Education, 1970
  • Jefferson Medical College, Philadelphia, PA, Doctor in Medicine (MD), 1974
  • San Juan City Hospital, Puerto Rico, Internal Medicine Residency, 1977
  • Medical College of Virginia, Infectious Diseases Fellowship, 1979

ACADEMIC PROFILES

ORCID: https://orcid.org/0000-0001-5929-9973   https://www.cienciapr.org/en/user/aserrano
LINKEDIN: https://pubmed.ncbi.nlm.nih.gov/?term=adelfa+e+serrano&sort=date
Bibliography: https://www.researchgate.net/profile/Adelfa-Serrano-Phd
Scholar: https://scholar.google.com/scholar?hl=en&as_sdt=0%2C5&q=Adelfa+E.+Serrano+Brizuela&btnG=
Bibliography: https://pubmed.ncbi.nlm.nih.gov/?sort=date&term=Vazquez+GJ&cauthor_id=27259867

RESEARCH INTEREST

Aerobiology outdoor aeroallergens

In addition to genetic factors the environment could be important to explain the high prevalence of asthma in Puerto Rico. Our laboratory is interested in the environmental factors that trigger asthma in the Island. After certification by the National Allergy Bureau of the American Academy of Allergy Asthma and Immunology (aaaai.org/nab) we have been reporting the daily concentration of pollen and fungal spores for the past 5 years. This is the only accredited facility working in the tropics and therefore could be pioneer in this type of studies for other tropical areas of the world. We have observed correlation between the high levels of fungal spores (red alert levels >139,000 spores/m3 and an increase in the utilization of medical services (emergency room visits and hospitalizations) due to asthma. The season of allergic rhinitis and asthma is during the rainy months of September through November. On this season the high dew point, relative humidity, and rain promote the liberation of the fungal spores.

Diagnosis of allergic conditions due to fungi

  • Molecular epidemiology of MRSA isolates from PR hospitals
  • Molecular mechanisms of antibiotic resistance to beta-lactam antibiotics in multidrug resistant gram-negative bacilli
  • Characterization of plasmids harboring KPC beta-lactamase gene and its genetic background in selected isolates of Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa and Acinetobacter baumannii collected from PR Hospitals

Purification of Ganoderma applanatum extracts of for the diagnosis of allergies.

The Ganoderma applanatum produces trillion of spores every day and therefore is a basidiomycete that is always detected in the air of San Juan. The skin test reactivity to crude extracts of G. applanatum was similar to the sensitivity to mites in a group of 33 patients with asthma and allergic rhinitis. This reactivity was significantly higher than of commercially available fungi. We will be purifying the crude extract of G. applanatum by isoelectric focusing and test the purified fractions for IgE reactivity using Western blots.

This assay will be tested as new immunodiagnostic tool for detection of allergies in PR and eventually in the immunotherapy of the patients sensitized to G. applanatum.

PUBLICATIONS

ARTICLES IN PUBMED (www.pubmed.com )

  • Draft Genome Sequence of a Multidrug-Resistant Klebsiella pneumoniae Carbapenemase-Producing Acinetobacter baumannii Sequence Type 2 Isolate from Puerto Rico. Martínez T, Ropelewski AJ, González-Mendez R, Vázquez GJ, Robledo IE. Genome Announc. 2016 Aug 18;4(4). pii: e00758-16. doi: 10.1128/genomeA.00758-16. PMID: 27540056 [PubMed] Free PMC Article
  • Genetic environment of the KPC gene in Acinetobacter baumannii ST2 clone from Puerto Rico and genomic insights into its drug resistance. Martinez T, Martinez I, Vazquez GJ, Aquino EE, Robledo IE. J Med Microbiol. 2016 Aug;65(8):784-92. doi: 10.1099/jmm.0.000289. Epub 2016 Jun 2.
    PMID: 27259867 [PubMed – in process]
  • Draft Genome Sequence of Klebsiella pneumoniae Carbapenemase-Producing Acinetobacter baumannii Strain M3AC9-7, Isolated from Puerto Rico. Martínez T, Ropelewski AJ, González-Mendez R, Vázquez GJ, Robledo IE. Genome Announc. 2015 Apr 9;3(2). pii: e00274-15. doi: 1128/genomeA.00274-15. PMID: 25858845 [PubMed] Free PMC Article
  • ISEcp1-mediated transposition of blaKPC into the chromosome of a clinical isolate of Acinetobacter baumannii from Puerto Rico. Martínez T, Vázquez GJ, Aquino EE, Martínez I, Robledo IE. J Med Microbiol. 2014 Dec;63(Pt 12):1644-8. doi: 10.1099/jmm.0.080721-0. Epub 2014 Sep 22.
    PMID: 25246647 [PubMed – indexed for MEDLINE] Free PMC Article
  • First report of a Pseudomonas aeruginosa clinical isolate co-harbouring KPC-2 and IMP-18 carbapenemases. Martínez T, Vázquez GJ, Aquino EE, Ramírez-Ronda R, Robledo IE. Int J Antimicrob Agents. 2012 Jun;39(6):542-3. doi: 10.1016/j.ijantimicag.2012.02.009. Epub 2012 Apr 20. No abstract available. PMID: 22521765 [PubMed – indexed for MEDLINE]
  • Two novel class I integron arrays containing IMP-18 metallo-β-lactamase gene in Pseudomonas aeruginosa clinical isolates from Puerto Rico. Martínez T, Vazquez GJ, Aquino EE, Goering RV, Robledo IE. Antimicrob Agents Chemother. 2012 Apr;56(4):2119-21. doi: 10.1128/AAC.05758-11. Epub 2012 Jan 30. PMID: 22290962 [PubMed – indexed for MEDLINE] Free PMC Article
  • KPC screening by updated BD Phoenix and Vitek 2 automated systems. Thomson KS, Robledo IE, Vázquez GJ, Moland ES. J Clin Microbiol. 2011 Sep;49(9):3386-7. doi: 10.1128/JCM.00772-11. Epub 2011 Jul 6. PMID: 21734025 [PubMed – indexed for MEDLINE] Free PMC Article
  • Detection of the KPC gene in Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, and Acinetobacter baumannii during a PCR-based nosocomial surveillance study in Puerto Rico. Robledo IE, Aquino EE, Vázquez GJ. Antimicrob Agents Chemother. 2011 Jun;55(6):2968-70. doi: 10.1128/AAC.01633-10. Epub 2011 Mar 28. PMID: 21444702 [PubMed – indexed for MEDLINE] Free PMC Article
  • Outbreak of carbapenem-resistant Klebsiella pneumoniae in Puerto Rico associated with a novel carbapenemase variant. Gregory CJ, Llata E, Stine N, Gould C, Santiago LM, Vazquez GJ, Robledo IE, Srinivasan A, Goering RV, Tomashek KM. Infect Control Hosp Epidemiol. 2010 May;31(5):476-84. doi: 10.1086/651670. PMID: 20334553 [PubMed – indexed for MEDLINE]
  • Detection of KPC in Acinetobacter spp. in Puerto Rico. Robledo IE, Aquino EE, Santé MI, Santana JL, Otero DM, León CF, Vázquez GJ. Antimicrob Agents Chemother. 2010 Mar;54(3):1354-7. doi: 10.1128/AAC.00899-09. Epub 2009 Dec 28.PMID: 20038618 [PubMed – indexed for MEDLINE] Free PMC Article
  • Surveillance of carbapenem-resistant Pseudomonas aeruginosa isolates from Puerto Rican Medical Center Hospitals: dissemination of KPC and IMP-18 beta-lactamases. Wolter DJ, Khalaf N, Robledo IE, Vázquez GJ, Santé MI, Aquino EE, Goering RV, Hanson ND. Antimicrob Agents Chemother. 2009 Apr;53(4):1660-4. doi: 10.1128/AAC.01172-08. Epub 2009 Feb 2.
    PMID: 19188398 [PubMed – indexed for MEDLINE] Free PMC Article
  • Abdominal pain and weight loss in an HIV-infected patient. Magno P, DE Jesus-Aponte R, Vazquez GJ, Garrastegui D, Torres EA. J Dig Dis. 2008 Feb;9(1):48-51. doi: 10.1111/j.1443-9573.2007.00317.x. No abstract available. PMID: 18251794 [PubMed – indexed for MEDLINE]
    13.The microbial etiologies of diarrhea in hospitalized patients from the Puerto Rico Medical Center Hospitals. Carrer M, Vázquez GJ, Lebrón RI, Mercado X, Martínez I, Vázquez CO, Santé M, Robledo IE. P R Health Sci J. 2005 Mar;24(1):41-4. PMID: 15895876 [PubMed – indexed for MEDLINE]
  • A comparison of the antimicrobial resistance patterns of gram-negative bacilli isolated from community-private and university-affiliated hospitals from Puerto Rico. Vázquez GJ, Robledo IE, Arroyo A, Nadal E, Rodríguez R, Bermúdez M, Colón M. P R Health Sci J. 2003 Sep;22(3):265-71.
    PMID: 14619453 [PubMed – indexed for MEDLINE]
  • A comparison of the antimicrobial resistance patterns of gram-positive cocci isolated from community-private and university-affiliated hospitals from Puerto Rico. Vázquez GJ, Robledo IE, Arroyo A, Nadal E, Rodríguez R, Bermudez M, Colón M. P R Health Sci J. 2003 Jun;22(2):131-6.
    PMID: 12866136 [PubMed – indexed for MEDLINE]
  • Prospective study using standardized methodology for antimicrobial susceptibility of gram-positive cocci isolated from the Puerto Rico Medical Center.  Rodríguez JL, Vázquez GJ, Bermúdez M, De Orbeta J, García Y, Rivera Y, Robledo IE. P R Health Sci J. 2002 Dec;21(4):343-7.
    PMID: 12572243 [PubMed – indexed for MEDLINE]
  • Paromomycin: no more effective than placebo for treatment of cryptosporidiosis in patients with advanced human immunodeficiency virus infection. AIDS Clinical Trial Group. Hewitt RG, Yiannoutsos CT, Higgs ES, Carey JT, Geiseler PJ, Soave R, Rosenberg R, Vazquez GJ, Wheat LJ, Fass RJ, Antoninievic Z, Walawander AL, Flanigan TP, Bender JF. Clin Infect Dis. 2000 Oct;31(4):1084-92. Epub 2000 Oct 25. PMID: 11049793 [PubMed – indexed for MEDLINE] Free Article
  • Diagnosis of malaria by polymerase chain reaction. Ferrer-Rodríguez I, Vázquez GJ, Córdova GJ, Serrano AE. P R Health Sci J. 1999 Jun;18(2):99-103. PMID: 10461315 [PubMed – indexed for MEDLINE]
  • Efficacy of antibiotic combinations including rifampin against methicillin-resistant Staphylococcus epidermidis: in vitro and in vivo studies. Archer GL, Johnston JL, Vazquez GJ, Haywood HB 3rd. Rev Infect Dis. 1983 Jul-Aug;5 Suppl 3:S538-42. PMID: 6556710 [PubMed – indexed for MEDLINE]
  • Preservation of Schistosoma mansoni eggs and of infected livers as a source of eggs for the circumoval precipitin test. Oliver-González J, Vázquez GJ. J Parasitol. 1983 Apr;69(2):277-9. PMID: 6854469 [PubMed – indexed for MEDLINE]
  • A randomized clinical trial of ceftizoxime and cefamandole in the treatment of serious lower respiratory tract infections. Rodriguez J, Vazquez GJ, Bermudez RH, Luina A, Ronda CH. J Antimicrob Chemother. 1982 Nov;10 Suppl C:209-13. No abstract available. PMID: 6296008 [PubMed – indexed for MEDLINE]
  • Antibiotic prophylaxis of experimental endocarditis due to methicillin-resistant Staphylococcus epidermidis. Archer GL, Vazquez GJ, Johnston JL. J Infect Dis. 1980 Nov;142(5):725-31. PMID: 7462687 [PubMed – indexed for MEDLINE]
  • Pulmonary nocardiosis: presentation of a case and a review of the literature]. Quiñones R, Vázquez GJ, Ramírez Ronda CH. Bol Asoc Med P R. 1980 Apr;72(4):174-7. Spanish. No abstract available. PMID: 6994757 [PubMed – indexed for MEDLINE]
  • Antibiotic therapy of experimental Staphylococcus epidermidis endocarditis. Vazquez GJ, Archer GL. Antimicrob Agents Chemother. 1980 Feb;17(2):280-5. PMID: 7387148 [PubMed – indexed for MEDLINE] Free PMC Article

ARTICLES NOT IN PUBMED

  • Jacobson JM, Greenspan JS, Spritzier J, Ketter N, Fahey JL, JacksonJ.B., Fox, I., Chernoff, M., WU, A., MacPhail LA, Vázquez GJ, and Wohl DA. Thalidomide for the treatment of oral aphthus ulcers in patients with human immunodeficiency virus infection.  NEJM, 336, pp. 1487-1493, 1997.
  • Dunne DW, Hillyer GV, and Vázquez GJ. Schistosoma mansoni cationic egg antigen (CEF6) immunoserology with oxamniquine-treated patients and involvement of CEF6 in the circumoval precipitin reaction. Am. J. Trop. Med. Hyg., 38(3) 508-514. 1988.
  • Nash TF, García Goyco C, Ruíz Tiben E, Nazario López HA and Vázquez GJ: 1983. Differentiation of acute and chronic schistosomiasis by antibody responses to specific schistosome antigens. American J. of Trop. Med. Hyg., 32(4) 776-784.
  • Ramírez-Ronda CH, Vázquez GJ, Ramírez-Ronda RA and Bermúdez RH: 1980. Sexually transmitted diseases. Part I: Gonococcal infection. Boletín Asoc. Médica de Puerto Rico, Vol. 12:251-264.

ABSTRACTS

  • Martinez, A. Ropelewski, G.J. Vázquez, R. González-Méndez, I. Martínez, E. E. Aquino and I.E. Robledo. Draft Genome of a KPC-Producing A. baumannii ST2 Clone and Insights into its Resistance Mechanisms. Abstract of the ICAAC-ICC 2015, San Diego, California, September 17-21, 2015
  • Rivera R, Pérez CM, Robledo IE, Vázquez GJ and Rodríguez Community-Associated Methicillin Resistant Staphylococcus aureus (CA-MRSA) from Public Beaches in Puerto Rico. Abstract 35th Annual Research and Education Forum, UPR-MSC March 25, 2015.
  • Martínez-Torres T, Morales FA, Vázquez GJ, Aquino EE, Fernandez-Sifre C andIraida E Robledo. Multidrug Resistant Acinetobacter baumannii (Ab) Isolates from a Private and a Teaching Hospital. Abstract 35th Annual Research and Education Forum, UPR-MSC March 25, 2015.
  • Martínez T, Vázquez GJ, Aquino EA, and Robledo IE. First Report of a Klebsiella pneumoniae ST 258 Clinical Isolate from Puerto Rico Co-Harboring KPC-2 and IMP-18 Carbapenemases. Abstract of the 54th Intersci. Conf. Antimicrob. Agents Chemother, Washington, DC, September 5-9, 2014
  • Martínez-Torres T, Vázquez GJ, Aquino EE andIraida E Robledo. Detection of Blaoxa-24 and Blaoxa-58 in Acinetobacter baumannii Clinical Isolates from Puerto Rico. Abstract of the 114th General Meeting American Society for Microbiology, Boston, MA, May 17-20, 2014.
  • Thomson K, Biehle J, Deeb A, Crawford J, Herrera R, Robledo I, Vázquez G. Bensal HP (BHP-410), a Novel Antimicrobial Agent with Activity against MRSA, VRE, Gram-Negative Multidrug Resistant Organisms, Yeast and Dermatophytic Fungi. Abstract of the 114th General Meeting American Society for Microbiology, Boston, MA, May 17-20, 2014.
  • Thomson GK, Robledo IE, Vazquez GJ, Snyder JW, Thomson KO. Comparison of 7 Commercially Prepared Media for Detection of KPC-producing Bacteria. Abstract of the 113th General Meeting American Society for Microbiology, Denver, Colorado, May 18-21, 2013.
  • Martínez-Torres T, Vázquez GJ, Aquino EE, Santana JL, Santé MI and Iraida E Robledo. Analysis of KPC-positive Gram-Negative Bacilli Clinical Isolates for the Periods of 2009 and 2012. Abstract 33rd Annual Research and Education Forum, UPR-MSC, March 13-15, 2013
  • Thomson KS, Robledo IE, Vázquez GJ, Seeking Active Agents Against KPC-producing Acinetobacter baumannii (KPCAB). Abstr. 52th Intersci. Conf. Antimicrob. Agents Chemother., Chicago IL; Sept 9-12, 2012.
  • Thomson KS, Robledo IE, Vázquez GJ, Moland ES. Antibiotic Selective Pressure and KPC-producing Klebsiella pneumoniae (KP). Abstr. 51th Intersci. Conf. Antimicrob. Agents Chemother., Chicago IL; Sept 17-20, 2011.
  • Martínez T, Vázquez GJ, Aquino EA, Robledo IE. Characterization of IMP-18 metallo-beta-lactamase gene in Pseudomonas aeruginosa collected in Puerto Rico. XXX1 RCM Research and Education Forum, UPR-MSC. May 5, 2011 (C-163).
  • Jetsen A. Rodríguez, Edna E. Aquino, Guillermo J. Vázquez and Iraida E. Robledo. Plasmid Typing of KPC Positive Acinetobacter baumannii. Abst. Annual Biomedical research Conference for Minority Students. November 10 – 13, 2010, Charlotte, North Carolina, 2010.
  • Moland ES, Robledo IE, Vázquez GJ, Thomson KS. KPC Screening by BD Phoenix and VITEK 2 Abstr. 50th Intersci. Conf. Antimicrob. Agents Chemother. Boston, MA; Sept 12-15, 2010. (D-745).
  • Goering R.V., Rivera R., Aquino E.E., Vázquez G.J., Goering R.V., Robledo I.E. mec-Associated dru typing identifies emergence of unique USA 300 community associated-methicillin resistant Staphylococcus aureus (CA_MRSA) in Puerto Rico (PR) Hospitals. Abstr. 50th Intersci. Conf. Antimicrob. Agents Chemother. Boston, MA; Sept 12-15, 2010. C2-1500a
  • Robledo I.E., Aquino E.E., Goering R.V., Vázquez G.J. Detection of IMP-18 metallo-beta-lactamase in Pseudomonas aeruginosa (Pa) Collected in Puerto Rico. Abstr. 50th Intersci. Conf. Antimicrob. Agents Chemother. Boston, MA, Sept 12-15, 2010.
  • Robledo I.E., , Aquino E.E., Vázquez G.J. Identification of CTX-M Genes in KPC Positive Escherichia coli (Ec), Klebsiella pneumoniae (Kp), Pseudomonas aeruginosa (Pa), and Acinetobacter baumannii (Ab) During a PCR-Based Surveillance Study in Puerto Rico (PR). Abstr. 50th Intersci. Conf. Antimicrob. Agents Chemother. Boston, MA, Sept 12-15, 2010.
  • Rivera R, Aquino E.E., Vázquez G.J., Goering R.V., Robledo I.E. Characterization of Community Acquired-Methicillin Resistant Staphylococcus aureus (CA-MRSA) Isolated from 4 Hospitals in Puerto Rico (PR). Abstr. 50th Intersci. Conf. Antimicrob. Agents Chemother. Boston, MA, Sept 12-15, 2010.
  • Aquino E.E., Vázquez G.J., Robledo I.E. Plasmid Analysis of KPC Positive Escherichia coli (Ec) Transconjugants Derived from Klebsiella pneumoniae (Kp) Collected in Puerto Rico. Abstr. 50th Intersci. Conf. Antimicrob. Agents Chemother. Boston, MA to be held in Sept 12-15, 2010.
  • Moland E.S., I. E. Robledo, G. J. Vazquez, K. S. Thomson. Antibiotic selection pressure and KPC β-lactamase. Abstract of the 110th General Meeting American Society for Microbiology, to be held in San Diego, California in May 23- 27, 2010.
  • Robledo I.E., Aquino E.E. and Vázquez G.J. Detection of KPC and other Beta-lactamases (BLs) in Acinetobacter species (AS), Pseudomonas aeruginosa (PA), Klebsiella pneumoniae (KP) and Escherichia coli (EC) during a PCRbased surveillance study in Puerto Rico (PR). Abstr. 49th Intersci. Conf. Antimicrob. Agents Chemother. San Francisco, CA. USA; Sept 12-15, 2009.
  • LLata E, Gregory C, Stine N, E. Lopez E, Laboy O, Soto RQ, Hernandez M, Lledo W, Hernandez E, Santiago N, García E, Cortes A, Vázquez GJ, Robledo IE, Patel J, Tomashek K, Srinivasan A and Gould C. Investigation of Carbapenem-Resistant Klebsiella Pneumoniae in Hospital A, Puerto Rico, 2008. Abts. 553 19th Society for Health Care Epidemiology of America, to be held on March 19-22, 2009, San Diego, CA.
  • Fernández C, Maldonado M, Aquino EA, Vázquez GJ, Santé MI, Robledo IE. First report of KPC-4, a carbapenem hydrolyzing enzyme in K. pneumoniae isolates in PR. XXVIII RCM Research and Education Forum, March 12-14, 2008, San Juan, PR.
  • Robledo IE, Vázquez GJ, Aquino EA, Moland ES, Santé MI, and Hanson ND. A Novel KPC Variant, KPC-6, in a Klebsiella pneumoniae (Kp) Isolated in Puerto Rico (PR). Abstract C2-3738 of the 48th Interscience Conference on Antimicrobial Agents and Chemotherapy (ICAAC) and the 46th Infectious Diseases Society of America (IDSA), October 25 to 28, 2008, Washington, DC.
  • Robledo IE, Vázquez GJ, Aquino EA, Moland ES, Santé MI, and Hanson ND. Dissemination and Molecular Epidemiology of KPC Producing K. pneumoniae (Kp) Collected in the Puerto Rico Medical Center Hospitals (PRMCH) During 2003-04. Abstract C2-3734of the 48th Interscience Conference on Antimicrobial Agents and Chemotherapy (ICAAC) and the 46th Infectious Diseases Society of America (IDSA), October 25 to 28, 2008, Washington, DC.
  • Robledo IE, Vázquez GJ, Moland ES, Aquino EE, Santé MI, and Hanson ND. First Report of K. pneumoniae (Kp) and E. coli (Ec) Isolated from Puerto Rico Medical Center Hospitals (PRMCHs) Producing Multiple b-Lactamases. Abst. 56th American Soc. of Tropical Medicine and Hygiene (ASTMH). Nov. 4-8, 2007, Philadelphia, PA.
  • Robledo IE, Vázquez GJ, Moland ES, Aquino EE, Santé MI, Bertrán J, and Hanson ND. First Report of KPC-4 Detected in Clinical Isolates of K. pneumoniae (Kp) and E. coli (Ec) from Puerto Rico (PR). Abst. 56th American Soc. of Tropical Medicine and Hygiene (ASTMH). Nov. 4-8, 2007, Philadelphia, PA.
  • Wolter DF, Vázquez GJ, Robledo IE, Santé MI, Goering RV, and Hanson ND. Detection of KPC Carbapenem Hydrolyzing b-lactamase in Pseudomonas aeruginosa (PA) from the Puerto Rico Medical Center Hospitals (PRMCHs). Abst. 47th Interscience Conference on Antimicrobial Agents and Chemotherapy (ICAAC). Sept. 16-20, 2007, Chicago, Il.
  • Robledo IE, Moland ES, Aquino EE, Vázquez GJ, Santé MI, and Hanson ND. First Report of a KPC-4 and CTX-M Producing K. pneumoniae (Kp) Isolated from Puerto Rico (PR). Abst. 47th Interscience Conference on Antimicrobial Agents and Chemotherapy (ICAAC). Sept. 16-20, 2007, Chicago, Il.
  • Lebrón-Ramos RI, Vázquez GJ, Alemar J, Nadal E, Gómez-Duarte C, Chinea B, Tomasini J, and Robledo IE. Antimicrobial resistance and genotypic characterization of Helicobacter pylori clinical isolates from Puerto Rico. Abst. C-254, 105th American Soc. for Microbiology. Atlanta, GA. June 5-9, 2005.
  • Ballesté CR, Vázquez GJ, Matos I, Gutiérrez S, Lebrón RI, Santé MI, and Robledo IE. Antimicrobial susceptibility of extended spectrum Beta-lactamases (ESBLs) positive Klebsiella pneumoniae (KP) and Escherichia coli (EC) clinical isolates from the Puerto Rico Medical Center. Abst. #359, 42nd Infectious Diseases Soc. of America, Boston, ,Massachusetts Sept. 30 – Oct. 3, 2004.
  • Nadal E, Vázquez GJ, Robledo IE, Arroyo A, Rodríguez R, and Bermúdez M. Comparison of the antimicrobial susceptibility patterns of gram-negative bacilli isolated from community private and university-affiliated hospitals from PR. American College of Physicians and Amer. Soc. of Internal Medicine PR Chapter. San Juan, PR. Feb. 13-15, 2003.
  • García M, Vázquez GJ, Robledo IE, Alemar J, Chinea B, Villafaña M, Gómez C, and Tomasini J. Antimicrobial susceptibility and molecular characterization of H. pylori isolates from Puerto Rico: Preliminary Report. Amer. College of Physicians and Amer. Soc. of Internal Medicine PR Chapter. San Juan, PR. February 13-15, 2003.
  • Alemar J, Vázquez GJ, Aquino E, and Robledo IE. Susceptibility patterns of Helicobacter pylori isolates from Puerto Rico. Biomedical Research Forum. San Juan, PR. April 18-19, 2002.
  • Arroyo A, Vázquez GJ, and Robledo IE. Antimicrobial susceptibility patterns of isolated bacteria from university affiliated and community hospitals from PR for the year 2000. Biomedical Research Forum. April 18-19- 2002.
  • Hewitt RG, Yiannoutsos CT, Carey J, Geiseler PJ, Soave R, Rosenberg R, Vázquez GJ, Wheat J, Fass RJ, Higgs ES, Antoninjevic Z, Walawander AL, Flanigan T, and Bender J. A double-blind, placebo-controlled trial of paromomycin for the treatment of cryptosporidiosis in patients with advanced HIV disease and CD4 counts under 150. 4th Conf. on Retroviruses and Opportunistic Infections. Washington, DC (USA). January 22-26, 1997.
  • Rivera-Castaño R, Vázquez GJ, Gadea CR, Cancel , Menar R, and Torres LJ. Efficacy and tolerance of norfloxacin vs. Ampicillin plus probenedic in the treatment of uncomplicated gonorrhea. 2d World Congress on Sexually Transmitted Diseases. Paris, France. (June 1986).
  • Gorbea HF, Hillyer GV, Rodríguez JR and Vázquez GJ. Correlation of serological and coprological parameters in 17 patients with chronic S. mansoni (SM). 25th ICAAC. Minneapolis (USA). (September 1985).
  • Yaugo B, Vázquez GJ, Baid I, and Bermúdez R. Ceftizoxime vs. Cefotaxime vs. Moxalactam therapy of high risk patients with pneumonia. 24th Interscience Conference on Antimicrobial Agents and Chemotherapy. Washington, D.C. (USA). (October 1984).
  • Hernández N, Rodríguez JP, Vázquez GJ, and Robles M. Efficiency of oral oxaminiquine for the treatment of chronic S. mansoni infection in Puerto Rico. 23th ICAAC. Las Vegas, NV (USA) (1983).
  • Harrington P, Nevárez M, Vázquez GJ, and Ramírez Ronda CH. Comparative effectiveness and safety of piperacillin and carbenicillin: A prospective randomized trial. 12th International Congress of Chemotherapy. Florence, Italy. (1981).
  • García Goyco C and Vázquez GJ. Oral oxamniquine for the treatment of S. mansoni infection. Research Week. San Juan, PR (1980).
  • Betz TG, Fiorilli M, Vázquez GJ, Sánchez Longo JP, Sotomayor ZR, and Sánchez G. Spinal cord involvement by S. mansoni in Puerto Rico. American Society of Tropical Medicine and Hygiene. Atlanta, GA. (Nov. 1980).
  • Vázquez GJ and Archer GL. Antibiotic prophylaxis of experimental S. epidermidis endocarditis. Southern Section
  • Vázquez GJ and Archer GL. Antibiotic therapy for experimental S. epidermidis endocarditis. 19th Interscience Conference on Antimicrobial Agent and Chemotherapy. Boston, MA (1979).