NEET BIOLOGY

Detailed explanation-1: -While only about 5% of bacterial species are pathogenic, bacteria have historically been the cause of a disproportionate amount of human disease and death.

Detailed explanation-2: -Most bacteria are not pathogenic. Those that are contain specific virulence genes that mediate interactions with the host, eliciting particular responses from the host cells that promote the replication and spread of the pathogen.

Detailed explanation-3: -Specifically, about one in a billion microbial species is a human pathogen. Indeed, approximately 1400 human pathogens have been described, whereas it has been estimated that there are one trillion microbial species on Earth, the vast majority of which remain uncharacterized [1].

Detailed explanation-4: -Most bacteria won’t hurt you-less than 1 percent of the different types make people sick. Many are helpful.