pathogens spread very quickly as right conditions in human body and they can feed on food and poisin it as they make toxins as feed. Disese spreads quick after disasters as sewage systems mix -so dirty water, electric supply limited so cant heat food up properly, fridge and freezers rationed supply so food decays, hospital may be destroyed or roads so disease passed airbourne. have to use aseptic techniqques when handling bacteria, heat equipment in autoclave to kill bacteria, surface disinfectant, wash hands, wear gloves, destroy bacteria after experiment, dont open lids of dishes. Yeast is a single celled organism and budding is asexual and identicle as nucleus copied, they need sugar, removal of waste lioke alcohol as can poisen yeast, temp of 40 is opt.
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