He also holds appointments at professional institutions, including Co-Editor of the journal SciEnggJ and Chair of the Biological Sciences Division at the NAST PHL for the term 2022 to 2025.

[1] Rivera holds patent to a novel, cost-effective diagnostic kit that uses salivary IgA concentrations to detect Entamoeba histolytica with high sensitivity and specificity, facilitating large-scale epidemiological studies and improved management of amebiasis.

[5] While exploring genetic diversity within Blastocystis isolates from humans, pigs, and chickens in the Philippines, his 2005 study revealed distinct patterns among isolates from different hosts, while also indicating genetic similarity within each host group and suggesting the potential for zoonotic transmission based on the presence of a zoonotic strain.

[6] In related research, he explored the genetic diversity and cross-transmissibility of Blastocystis species in the Philippines, analyzing isolates from both animal and human hosts, demonstrating high similarity among sequences.

In this regard, he published a paper in 2021, wherein he examined Cryptosporidium contamination in the lake and its tributaries, identifying sources of fecal pollution from human sewage and livestock.

[10] Later in the same year, he proposed a method for enhancing fecal contamination monitoring in Laguna Lake using a DNA fingerprinting library and Random Forest statistical analysis to accurately identify and track sources of Escherichia coli pollution.