Organisms which feed on microbes (bacteria and fungi) are termed microbivores. Humans can be infected with many types of pathogens including prions, viruses, bacteria, and fungi. Bacterial chromosomes tend to be tethered to the plasma membrane of the bacteria. Bacteriophages are viruses that infect bacteria and archaea. They infect all types of cellular life including animals, plants, bacteria and fungi. Infectious agents include viruses, bacteria, and parasites. Flucloxacillin is indicated for the treatment of infections caused by susceptible bacteria. Efficacy was described for numerous bacteria and fungi. It is due to toxins produced by bacteria in food. Shigellosis is an infection of the intestines caused by "Shigella" bacteria. Either bacteria or viruses may be involved. They are typically due to infection by a number of types of bacteria. An antibiotic is a type of antimicrobial substance active against bacteria. This article deals with human pathogenic bacteria. Many infections caused by "peptostreptococcus" bacteria are synergistic.