"Opportunistic" refers to someone who takes advantage of opportunities, even if it means acting immorally, unethically, or without consideration for others. Full definition
According to the World Health Organization (WHO), 150,000 children with HIV under 15 years of age died of opportunistic infections in low - to - middle income countries in 2014 alone. (sciencedaily.com)
Many of the pathogenic organisms reported to be inactivated by these antimicrobial lipids are those known to be responsible for opportunistic infections in HIV - positive individuals. (westonaprice.org)
As pH shifts, prospects for opportunistic pathogens increase, as does opportunities for gram - negative bacteria like Bacteroides and Enterobacter. (humanfoodproject.com)