Protozoan Diversity, Diagnosis, and Pathogenesis

1. Rivera WL, Tachibana H, Silva-Tahat MRA, Uemura H, Kanbara H. 1996. Differentiation of Entamoeba histolytica and E. dispar DNA from cysts present in stool specimens by polymerase chain reaction: its field application in the Philippines. Parasitology Research 82: 585-589.
   
   
2. Rivera WL, Tachibana H, Kanbara H. 1998. Field study on the distribution of Entamoeba histolytica and Entamoeba dispar in the northern Philippines as detected by the polymerase chain reaction. American Journal of Tropical Medicine and Hygiene 59: 916-921.
   
   
3. Rivera WL, Tachibana H, Kanbara H. 1999. Application of polymerase chain reaction (PCR) in the epidemiology of Entamoeba histolytica and Entamoeba dispar infections. Tokai Journal of Experimental and Clinical Medicine 23: 413-415.
   
   
4. Rivera WL, Kanbara H. 1999. Detection of Entamoeba dispar DNA in macaque feces by polymerase chain reaction. Parasitology Research 85: 493-495.
   
   
5. Nok JA, Rivera WL. 2003. Characterization of sialidase from Entamoeba histolytica and its possible pathogenic role in amebiasis. Parasitology Research 89: 302-307. DOI 10.1007/s00436-002-0646-z
   
   
6. Rivera WL, Tan MAV. 2005. Molecular characterization of Blastocystis isolates in the Philippines by riboprinting. Parasitology Research 96: 253-257. DOI 10.1007/s00436-005-1344-4
   
   
7. Rivera WL, Yason JADL, Rivera PT. 2005. Serological detection of cryptosporidiosis among Filipino cancer patients. Parasitology Research 98: 75-76. DOI 10.1007/s00436-005-0014-x
   
   
8. Rivera WL, Santos SR, Kanbara H. 2006. Prevalence and genetic diversity of Entamoeba histolytica in an institution for the mentally retarded in the Philippines. Parasitology Research 98: 106-110 DOI 10.1007/s00436-005-0024-8
   
   
9. Valido EM, Rivera WL. 2007. Colony growth of Philippine isolates of Blastocystis hominis in simplified, soft agar medium. Parasitology Research 101: 213-217. DOI 10.1007/s00436-006-0456-9.
   
   
10. Yason JADL, Rivera WL. 2007. Genotyping of Giardia duodenalis isolates among residents of slum area in Manila, Philippines. Parasitology Research 101:681-687. DOI 10.1007/s00436-007-0533-8
    
    
11. Canoy ICG, Rivera WL. 2007. Production and characterization of polyclonal antibodies specific for Entamoeba histolytica. Philippine Journal of Science 136: 131-138.
    
    
12. Rivera PT, Rivera WL, Escueta AS, Villacorte EA, Limlingan ET, Lazaro CM, Kanbara H. 2007. Prevalence of serologically positive amebic liver abscess cases in the Philippines. Acta Medica Philippina 41: 31-36.
    
    
13. Rivera WL. 2008. Phylogenetic analysis of Blastocystis isolates from animal and human hosts in the Philippines. Veterinary Parasitology 156: 178-182. DOI 10.1016/j.vetpar.2008.06.001
    
    
14. Rivera WL, Adao DEV. 2008. Identification of the 18S-ribosomal-DNA genotypes of Acanthamoeba isolates from the Philippines. Annals of Tropical Medicine and Parasitology 102: 671-677. DOI 10.1179/136485908X337544
    
    
15. Rivera WL, Yason JADL. 2008. Molecular detection of Cryptosporidium from animal hosts in the Philippines. Philippine Agricultural Scientist 91: 473-477.
    
    
16. Rivera WL, Lupisan AJB, Baking JMP. 2008. Ultrastructural study of a tetratrichomonad isolated from pig fecal samples. Parasitology Research 103: 1311-1316. DOI 10.1007/s00436-008-1134-x
    
    
17. Tan MAV, Rivera WL. 2008. Genotypic characterization of Blastocystis isolates in the Philippines. Philippine Journal of Veterinary Medicine 45: 86-94.
    
    
18. Santos HJ, Maiquilla SMB, Rivera WL. 2008. Polyclonal IgG response of Balb/c mice to the 23kDa antigen of Entamoeba histolytica. Science Diliman 20: 11-17.
    
    
19. Rivera WL, Adao DEV. 2009. 18S ribosomal DNA genotypes of Acanthamoeba species isolated from contact lens cases in the Philippines. Parasitology Research 105: 1119-1124. DOI 10.1007/s00436-009-1531-9
    
    
20. Santos HJ, Rivera WL. 2009. Kinetic analysis of antibody responses to Blastocystis hominis in sera and intestinal secretions of orally infected mice. Parasitology Research 105: 1303-1310. DOI 10.1007/s00436-009-1556-0
    
    
21. Rivera WL, Ong VA, Masalunga MC. 2009. Molecular characterization of Trichomonas vaginalis isolates from the Philippines. Parasitology Research 106: 105-110. DOI 10.1007/s00436-009-1635-2
    
    
22. Nilles-Bije ML, Rivera WL. 2010. Ultrastructural and molecular characterization of Balantidium coli isolated in the Philippines. Parasitology Research 106: 387-394. DOI 10.1007/s00436-009-1673-9
    
    
23. Rivera WL, Yason JADL, Adao, DEV. 2010. Entamoeba histolytica and E. dispar infections in captive macaques (Macaca fascicularis) in the Philippines. Primates 51: 69-74. DOI 10.1007/s10329-009-0174-x
    
    
24. Ong VA, Rivera WL. 2010. Production and characterization of polyclonal antibodies specific for Trichomonas vaginalis. Asia Life Sciences 19: 345-356.
    
    
25. Ong VA, Rivera WL. 2010. Prevalence of Trichomonas vaginalis in vaginal swabs from sex workers in Angeles City, Pampanga, Philippines as detected by PCR. Tropical Medicine and Health 38: 29-34.
    
    
26. Petronio JAG, Rivera WL. 2010. Ultrastructure and SSU rDNA phylogeny of Paraphysomonas vestita (Stokes) De Saedeleer isolated from Laguna de Bay, Philippines. Acta Protozoologica 49: 107-113.
    
    
27. Banaticla JEG, Rivera WL. 2011. Detection and subtype identification of Blastocystis isolates from wastewater samples in the Philippines. Journal of Water and Health 9: 128-136. DOI: 10.2166/wh.2010.127
    
    
28. Rivera WL, Santos HJ, Ong VA, Murao LJ. 2012. Profiles of Entamoeba histolytica-specific immunoglobulins in human sera. Asian Pacific Journal of Tropical Medicine. 5: 234-238. DOI 10.1016/S1995-7645(12)60031-5
    
    
29. Villareal MV, Mingala CN, Rivera WL. 2013. Molecular characterization of Trypanosoma evansi isolates from water buffaloes (Bubalus bubalis) in the Philippines. ActaParasitologica. 58: 6-12.
    
    
30. Rivera WL, Ong VA. 2013. Development of loop-mediated isothermal amplification for rapid detection of Entamoeba histolytica. Asian Pacific Journal of Tropical Medicine. 6(6): 457-461.
    
    
31. Santos HJ, Rivera WL. 2013. Comparison of direct fecal smear microscopy, culture, and polymerase chain reaction for the detection of Blastocystis sp. in human stool samples. Asian Pacific Journal of Tropical Medicine. 6(10): 780-784.
    
    
32. Queza MIP, Rivera WL. 2013. Diagnosis and molecular characterization of Trichomonas vaginalis in sex workers in the Philippines. Pathogens and Global Health. 107(3): 136-140. 10.1179/2047773213Y.0000000085
    
    
33. Dimasuay KGB, Rivera WL. 2013. Molecular characterization of trichomonads isolated from animal hosts in the Philippines. Veterinary Parasitology. 196(3-4): 289-295. DOI 10.1016/j.vetpar.2013.03.019
    
    
34. Dimasuay, KGB, Lavilla OJY, Rivera WL. 2013. New hosts of Simplicimonas similis and Trichomitus batrachorum identified by 18S ribosomal RNA gene sequences. Journal of Parasitology Research. DOI 10.1155/2013/831947.
    
    
35. Dimasuay KGB, Rivera WL. 2014. First report of Trichomonas tenax infections in the Philippines. Parasitology International. 63: 400-402. DOI 10.1016/j.parint.2013.12.015
    
    
36. Reyes JCB, Solon JAA, Rivera WL. 2014. Development of a loop-mediated isothermal amplification assay for detection of Trichomonas vaginalis. Diagnostic Microbiology and Infectious Disease. 79: 337-341. DOI 10.1016/j.diagmicrobio.2014.03.016
    
    
37. Cruz ARS, Rivera WL. 2014. Genotype analysis of Acanthamoeba isolates from human nasal swabs in the Philippines. Asian Pacific Journal of Tropical Medicine. 7S1: S74-S78. DOI 10.1016/S1995-7645(14)60206-6
    
    
38. Salvador-Membreve DMC, Jacinto SD, Rivera WL. 2014. Trichomonas vaginalis induces cytopathic effect on human lung alveolar basal carcinoma epithelial cell line A549. Experimental Parasitology. 147: 33-40. DOI 10.1016/j.exppara.2014.10.003
    
    
39. Obusan MCM, Aragones LV, Salibay CC, Siringan MAT, Rivera WL. 2015. Occurrence of human pathogenic bacteria and Toxoplasma in cetaceans stranded in the Philippines: providing clues on ocean health status. Aquatic Mammals. 41: 149-166. DOI 10.1578/AM.41.2.2015.149
    
    
40. Belleza MLB, Cadacio JLC, Borja MP, Solon JAA, Padilla MA, Tongol-Rivera PN, Rivera WL. 2015. Epidemiologic study of Blastocystis infection in an urban community in the Philippines. Journal of Environmental and Public Health. Article ID 894297. DOI 10.1155/2015/894297
    
    
41. Rivera WL, Justo CAC, Relucio-San Diego MACV, Loyola LM. 2016. Detection and molecular characterization of double-stranded RNA viruses in Philippine Trichomonas vaginalis isolates. Journal of Microbiology, Immunology and Infection. doi: 10.1016/j.jmii.2015.07.016
    
    
42. Belleza ML, Reyes JC, Tongol-Rivera PN, Rivera WL. 2016. Subtype analysis of Blastocystis sp. from human and canine hosts in an urban community in the Philippines. Parasitology International. 65: 291-294. DOI 10.1016/j.parint.2016.02.009
    
    
43. Adao DE, Rivera WL. 2016. Loop-mediated isothermal amplification (LAMP) assay for the rapid detection of the sexually-transmitted parasite, Trichomonas vaginalis. Annals of Parasitology. 62: 25-31. DOI 10.17420/ap6201.28
    
    
44. Evidor FM, Rivera WL. 2016. Genetic subtypes of Blastocystis isolated from fecal materials in large intestines of slaughtered swine. Philippine Journal of Veterinary Medicine. 53: 59-64.
    
    
45. Adao DEV, Ducusin RJT, Padilla MA, Rivera WL. 2016. Molecular characterization of Blastocystis isolates infecting farm animals in Victoria and Pila, Laguna, Philippines. Philippine Agricultural Scientist. 99: 304-310.
    
    
46. Adao DEV, Dela Serna AO, Belleza ML, Bolo NR, Rivera WL. 2016. Subtype analysis of Blastocystis sp. isolates from asymptomatic individuals in an urban community in the Philippines. Annals of Parasitology. 62: 193-200. doi: 10.17420/ap6203.53
    
    
47. Obusan MCM, Rivera WL, Siringan MAT, Aragones LV. 2016. Stranding events in the Philippines provide evidence for impacts of human interactions on cetaceans. Ocean and Coastal Management. 134: 41-51. DOI 10.1016/j.ocecoaman.2016.09.021
    
    
48. Pagoso EJA, Rivera WL. 2017. Cryptosporidium species from common edible bivalves in Manila Bay, Philippines. Marine Pollution Bulletin. 119: 31-39. DOI 10.1016/j.marpolbul.2017.03.005
    
    
49. De La Peña LBRO, Pagoso EJA, Rivera WL. 2017. Characterization of Cryptosporidium isolated from Asian green mussels in wet markets of Quezon City, Philippines. Philippine Agricultural Scientist. 100: S45-S54.
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50. Adao DE, Herrera CMT, Galarion LH, Bolo NR, Carlos RS, Carlos ET, Carlos SS, Rivera WL. 2017. Detection and molecular characterization of Hepatozoon canis, Babesia vogeli, Ehrlichia canis, and Anaplasma platys in dogs from Metro Manila, Philippines. Korean Journal of Veterinary Research. 57: 79-88. DOI 10.14405/kjvr.2017.57.2.79
    
    
51. Adao DEV, Rivera WL. 2018. Recent advances in Blastocystis sp. research. Philippine Science Letters. 11(1): 39-50.
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52. Espiritu CLA, Justo CAC, Rubio MJ, Svobodova M, Bashammakh AS, Alyoubi AO, Rivera WL, Rollon AP, O’ Sullivan CK. 2018. Aptamer Selection against a Trichomonas vaginalis adhesion protein for Diagnostic Apllications. America Chemical Society Infectious Diseases. DOI 10.1021/acsinfecdis.8b00065

Natural Products Research

1. Taganna JC, Rivera WL. 2008. Epigallocatechin gallate from Camellia sinensis L. (Kuntze) is a potential quorum sensing inhibitor in Chromobacterium violaceum. Science Diliman 20: 24-30.

2. Vital PG, Rivera WL. 2009. Antimicrobial activity and cytotoxicity of Chromolaena odorata (L.f.) King and Robinson and Uncaria perrottetii (A. Rich) Merr. extracts. Journal of Medicinal Plants Research 3: 511-518.

3. Vital PG, Velasco RN, Demigillo JM, Rivera WL. 2010. Antimicrobial activity, cytotoxicity, and phytochemical screening of Ficus septic Burm and Sterculia foetida L. leaf extracts. Journal of Medicinal Plants Research 4: 58-63.

4. Lamberte LE, Cabrera EC, Rivera WL. 2011. Activity of ethanolic extract of propolis (EEP) as a potential inhibitor of quorum sensing-mediated pigment production in Chromobacterium violaceum and virulence factor production in Pseudomonas aeruginosa. Philippine Agricultural Scientist 94: 14-22.
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5. Cornago DF, Amor EC, Rivera WL. 2011.  Antifungal activity of onion (Allium cepa L.) bulb extracts against Fusarium oxysporum and Colletotrichum sp. Philippine Agricultural Scientist 94: 78-82.

6. Salapare HS, Blantocas GQ, Rivera WL, Ong VA, Hipolito RS, Ramos HJ. 2011. Antibacterial property of hydrogen ion and oxygen ion treated polytetrafluoroethylene (PTFE) materials. Plasma and Fusion Research. 6: 1-4.

7. Taganna JC, Quanico JP, Perono RMG, Amor EC, Rivera WL. 2011. Tannin-rich fraction from Terminalia catappa inhibits quorum sensing (QS) in Chromobacterium violaceum and the QS-controlled biofilm maturation and LasA staphylolytic activity in Pseudomonas aeruginosa. Journal of Ethnopharmacology 134: 856-871.

8.Vital PG, Rivera WL. 2011. Antimicrobial activity, cytotoxicity, and phytochemical screening ofVoacanga globosa (Blanco) Merr. leaf extract (Apocynaceae). Asian Pacific Journal of Tropical Medicine. 4: 824-828.

9. Valle DL Jr, Andrade JI, Puzon JJM, Cabrera EC, Rivera WL. 2015. Antibacterial activities of ethanol extracts of Philippine medicinal plants against multidrug-resistant bacteria. Asian Pacific Journal of Tropical Biomedicine. 5: 532-540

10. Martin-Puzon JJM, Valle DL, Rivera WL. 2015. TLC profiles and antibacterial activity of Glinus oppositifolius (L.) Aug. DC. (Molluginaceae) leaf and stem extracts against bacterial pathogens. Asian Pacific Journal of Tropical Disease. 5: 569-574.

11. Martin-Puzon JJM, Rivera WL. 2015. Free-radical scavenging activity and bioactive secondary metabolites from various extracts of Glinus oppositifolius (L.) Aug. DC. (Molluginaceae) roots, stems and leaves. Asian Pacific Journal of Tropical Disease. 5: 711-715.

12. Valle DL, Cabrera EC, Puzon JJM, Rivera WL. 2016. Antimicrobial activities of methanol, ethanol and supercritical CO2 extracts of Philippine Piper betle L. on clinical isolates of Gram positive and Gram negative bacteria with transferable multiple drug resistance. Plos One. doi: 10.1371/journal.pone.0146349.

13. Valle DL, Puzon JJM, Cabrera EC, Rivera WL. 2016. Thin layer chromatography-bioautography and gas chromatography-mass spectrometry of antimicrobial leaf extracts from Philippine Piper betle L. against multidrug resistant bacteria. Evidence-based Complementary and Alternative Medicine. Article ID 4976791.
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14. Salas RL, Garcia KJDL, Miranda ACR, Rivera WL, Nellas RB, Sabido PMG. 2018. Effects of truncation of the peptide chain on the secondary structure and bioactivities of palmitoylated anoplin. Peptides. 104(2018) 7-14. DOI 10.1016/j.peptides.2018.03.019

Applied Bacteriology

1. Valle Jr. DL, Andrade JI, Cabrera EC, Rivera WL. 2010. Evaluation of buffy coat 16S rRNA PCR, buffy coat culture and whole blood PCR for detection of bacteraemia. Memorias do Instituto Oswaldo Cruz 105: 117-122.
   
   
2. Nemenzo PS, Rivero GC, Rivera WL. 2012. Characterization of potential plant growth promoting rhizobacterial isolates from sago (Metroxylon sagu Rottb.) palms. Philippine Agricultural Scientist. 95: 85-91.
   
   
3. Nicdao MAC, Rivera WL. 2012. Two strains of Gordonia terrae isolated from used engine oil-contaminated soil utilize short- to long-chain n-alkanes. Philippine Science Letters. 5:199-208.
   
   
4. Ng KCS, Rivera WL. 2014. Antimicrobial resistance of Salmonella enterica isolates from tonsil and jejunum with lymph node tissues of slaughtered swine in Metro Manila, Philippines. ISRN Microbiology. http://dx.doi.org/10.1155/2014/364265.
   
   
5. Vital PG, Dimasuay KGB, Widmer KW, Rivera WL. 2014. Microbiological quality of fresh produce from open air markets and supermarkets in the Philippines. The Scientific World Journal. http://dx.doi.org/10.1155/2014/219534.
   
   
6. Abad RG, Batian JSA, Catiempo RL, Salamanes ML, Nemenzo-Calica P, Rivera WL. 2014. Molecular profiling of different morphotypes under the genus Rhynchophorus (Coleoptera Curculionidae) in Central and Southern Philippines. Journal of Entomology and Nematology. http://dx.doi.org/10.5897/JEN12.014.
   
   
7. Ng KCS, Rivera WL. 2015. Multiplex PCR-based serogrouping and serotyping of Salmonella spp. from tonsil and jejunum with jejunal lymph nodes of slaughtered swine in Metro Manila, Philippines. Journal of Food Protection. 78:873-880.
   
   
8. Daupan SMMV, Rivera WL. 2015. Isolation and characterization of culturable thermophilic bacteria from hot springs in Benguet, Philippines. International Journal of Philippine Science and Technology. 8: 14-18.
   
   
9. Garcia BCB, Dimasupil MAZ, Vital PG, Widmer KW, Rivera WL. 2015. Fecal contamination in irrigation water and microbial quality of vegetable primary production in urban farms of Metro Manila, Philippines. Journal of Environmental Science and Health, Part B. 50: 734-743.
   
   
10. Soguilon-Del Rosario SA, Rivera WL. 2015. Incidence and molecular detection of Salmonella enterica serogroups and spvC virulence gene in raw and processed meats from selected wet markets in Metro Manila, Philippines. International Journal of Philippine Science and Technology. 8: 52-55.
    
    
11. Valle DL, Paclibare PAP, Cabrera EC, Rivera WL. 2016. Molecular and phenotypic characterization of methicillin-resistant Staphylococcus aureus isolates from a tertiary hospital in the Philippines. Tropical Medicine and Health. 44: 3 DOI 10.1186/s41182-016-0003-z
    
    
12. Galarion LH, Rivera WL. 2016. Isolation and characterization of marine sediment bacteria capable of biocatalyzing bromination of indole. Journal of Scientific and Industrial Research. 75: 359-364.
    
    
13. Feliciano CP, Rivera WL. 2016. Data on preparation of psychrotolerant bacterium Shewanella olleyana sp. nov. cells for transmission electron microscopy. Data in Brief. 9: 710-715.
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14. Calayag AMB, Paclibare PAP, Santos PDM, Bautista CA, Rivera WL. 2017. Molecular characterization and antimicrobial resistance of Salmonella enterica from swine slaughtered in two different types of Philippine abbatoir. Food Microbiology. 65: 51-56.
    
    
15. Paraoan EC, Rivera WL, Vital PG. 2017. Detection of class I and II integrons for the assessment of antibiotic and multidrug resistance among Escherichia coli isolates from agricultural irrigation waters in Bulacan, Philippines. Journal of Environmental Science and Health, Part B. 52: 306-313.
    
    
16. Paclibare PAP, Calayag AMB, Santos PDM, Rivera WL. 2017. Molecular characterization of Salmonella enterica isolated from raw and processed meats from selected wet markets in Metro Manila, Philippines. Philippine Agricultural Scientist. 100: S55-S62.
    
    
17. Vital PG, Caballes MB, Rivera WL. 2017. Antimicrobial resistance in Escherichia coli and Salmonella spp. Isolates from fresh produce and the impact to food safety. Journal of Environmental Science and Health, Part B. doi: 10.1080/03601234.2017.1331676.
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18. ​Vital PG, Zara ES, Paraoan CEM, Dimasupil MAZ, Abello JJM, Santos ITG, Rivera WL. 2018. Antibiotic Resistance and Extended-Spectrum Beta-Lactamase Production of Escherichia coli Isolated from Irrigation Waters in Selected Urban Farms in Metro Manila, Philippines. Water. 2018. 10, 548. DOI 10.3390/w10050548
    
    
19. Valle DL, Jr., Cabal ABS, Paclibare PAP, Rivera WL. 2018. Enteroaggregative Escherichia coli infections among children in  a tertiary hospital in the Philippines. Southeast Asian Journal of Tropical Medicine and Public Health. 49:3, March 2018, page 409-20.
    
    
20. Mathay ACMTA, Dimasupil MAZ, Rivera WL, Vital PG. 2018. Bacteriological screening of fresh and fresh-cut fruits vended in select open air open air markets and supermarkets in Metro Manila, Philippines. Philippine Science Letters. 11(Supplement): 37-42.
    
    
21. Justo CAC, Mapile MRF, Santos PDM, Rivera WL. 2018. Determination of the optimal pre-enrichment period for the detection of Salmonella enterica in artificially inoculated meat products using culture, PCR and LAMP assays. Philippines Science Letter. 11(Supplementary): 43-50.
    
    
22. Obusan MCM, Aragones LV, Rivera WL, Siringan MAT. 2018. Antibiotic Susceptibility Patterns of Bacteria Isolated from Cetaceans Stranded in the Philippines. Aquatic Mammals. 44(5): 568-579. DOI 10.1578/AM.44.5.2018.568