Bacillus cereus - common in soil, spores are ubiquitous. If present in cooked food, where there is no co mpetition, spores germinate, grow rapidly and produce toxins. C. Viral diseases of the digestive system 1. Mumps - infection of the parotid glands. Droplet spread via saliva and respiratory secretions.
Most virus is shed before symptoms appear.
Viremia can result in deposition of virus in testes, ovaries, pancreas, meninges. Attenuated live vaccine is part of MMR 2. Cytomegalovirus inclusion disease. Biggest danger is to unborn fetus 3. Fig 25.15 for a diagram of Hepatitis B virus.