id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-000614-gl9cjmno	Pang, Xinghuo	Pandemic (H1N1) 2009 among Quarantined Close Contacts, Beijing, People’s Republic of China	2011-10-17		.txt	text/plain	3947	197	52	We estimated the attack rate of pandemic (H1N1) 2009 and assessed risk factors for infection among close contacts quarantined in Beijing, People's Republic of China. These studies were conducted in outbreak settings, and attack rates were calculated on the basis of clinical diseases that included infl uenza-like illness (ILI) or acute respiratory illness (ARI) of close contacts rather than confi rmed infection with pandemic (H1N1) 2009 virus. Public health workers conducted epidemiologic investigation of all index case-patients (including those with subclinical infections) and traced and quarantined close contacts whose residence was within the jurisdiction of Beijing. We estimated the attack rate of pandemic (H1N1) 2009 virus infection and assessed risk factors or correlates for infection among different types of close contacts, including household members and aircraft passengers. The overall attack rate for infection among close contacts (positive test result) was 2.4% (167 of 7,099), indicating that 1 index case-patient transmitted infection to 0.27 close contacts (167 of 613) on average (reproduction number = 0.27).	./cache/cord-000614-gl9cjmno.txt	./txt/cord-000614-gl9cjmno.txt