Another past exam paper question from students

When there is no bacteria detected in the food, it does not mean that the food is safe.  There can be toxins. And in this case, it is likely to be Staphylococcus toxin if the incubation period is as short as a few hours.

Best,

HS Kwan

-----Original Message-----
From: LLLLL
Sent: Friday, May 04, 2012 5:08 PM
To: hoishankwan@cuhk.edu.hk
Subject: FNSC4180 - Questions about 2010 past paper

Dear Prof. Kwan,

I would like to ask what is the pathogenic microoragism in question 11.

We cannot deduce which microorganism cause the outbreak.

We have already eliminated S.E. and C.P. as the incubation peroid does

not match.

Besides, accroding to our calculation, pizza has the highest attack rate,

however, no bacteria were found on the toppings or the dough of the pizza.