Q and A
- 2014-2015 B2. If I know that the suspected food is pizza from (a), do I also need to calculate the incubation period assuming dinner is the problem?
Yes, you should check every piece of information to ensure your conclusion is close to the truth.
- I dont understand what you mean by elimination. Do I need to refer to every other food served at the picnic and its attack rate? (eg. Although Salmonella entericaserotype Typhimurium is found in both the sushi and faeces of patients, it seems that sushi is not likely to be the food of problem as it has the lowest positive difference between the attack rate of those who ate and those who didn’t. )
Yes, eliminate other possibilities with information at hand. For example, S Typhimurium in this case would probably not the agent because of the attack rate and incubation time are not consistent with it being the agent. You have to do this because disease may not be caused by a single pathogen but may be caused by more than one. You also need to explain any inconsistence observed.
- 2013-2014 QB1 (b) x : Occurred frequently in child-care centers : Human rotavirus. Is this correct?
No, should be Norovirus
- 2014-2015 QB1 (b)viii : Occurrence and growth in fresh cream even stored in refrigerator: Listeria monocytogenes
Yes, it can grow at refrigeration temperature and may exist in fresh cream
- 2014-2015 QB1 (b) Occurred frequently in child-care centers and caused vomiting: Is it nora virus or human rotavirus?
Norovirus is the better choice.
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