Question

1. On March 1, 2009, 13 people became ill after attending a retirement dinner for a colleague. The symptoms were acute gastritis, vomiting, and fever. Using the food histories in the table below for the 20 individuals attending the dinner, construct an attack rate table and determine the most likely source of the outbreak. Justify your response. Person Became Ill? Ate Beef? Ate Chicken? Ate Salad? 1 Yes Yes 2 3 Yes Yes No Yes Yes Yes Yes No Yes Yes 4 5 6 7 8 9 No Yes No Yes Yes Yes Yes Yes Yes Yes Yes No No No No Yes No Yes No Yes No Yes Yes No 10 11 12 13 No Yes No No No Yes No No Yes Yes No No No No Yes No 14 Yes Yes Yes Yes 15 16 17 18 19 20 No No Yes Yes Yes Yes No No Yes Yes Yes Yes No Yes No No Yes Yes Yes No Yes Yes No No You need to show step-by-step calculations to earn maximum credit.

Answer 1

froni llie Obrerved dala, Criven abal. people 13 became ill agron atending a relirement diame for a collegue. lhe syniptoons were ailele gastritie vomilinge and fever. Using the food victories in the above table or lhe 20 individuale allerding Summarise Ilie given information, llic dinnen 171 Nott toral Became [ !! 13 7. 220 13 7 20 Ate Beef Ale chicken 9 20 Ale salad 00 LO A Hack rate table for the given information is , NORI total Alact Atlant wata rate % 0.65 65 Became !!! Y 20 13 0.65 65 Ate Beef 7 13 20 LO 0:55 ss Ale chicken 9. 20 0.05 5 Ate salael 10 10

here, the formula for all art rate is Neimber of 11 Poral memben :for became ili, the attack rate is 0.65 and attact rate precient is 65%. for Are Beef, the attack rate is 0.65 aud attal role is 65% percent for Ale chicken, the atlaet rote is 0.55 Quce attack rate percent is 55% for Ale salall, the attack rate is 0.05 auce atiacke rate pucent 5%. So this most likely source of the out brear the given dara is.. Ale beef. from Please give up Lote for my woir.