types of human pathogen. pathogenic bacteria viruses or fungi can enter the body

acellular bacillus bacteria bacterium biology body cancer cause cell cellular collection danger diagram disease duodenalis echinococcus epidemic epidermophyton flu fungi germ giardia health helicobacter human icon illness infection influenza living medical medicine micro microbe microbiology microorganism microscopic nonliving norovirus organism pandemic parasite parasites pathogen pathogenic poster prion protozoa pylori research science set symbol type vector viruses yeast