id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-298086-pbfi5c8e	Lyngse, F. P.	COVID-19 Transmission Within Danish Households: A Nationwide Study from Lockdown to Reopening	2020-09-09		.txt	text/plain	7792	547	63	Methods We used comprehensive administrative register data from Denmark, comprising the full population and all COVID-19 tests, to estimate household transmission risk and attack rate. To our knowledge, this is the first nationwide study that uses estimates of household attack rates and transmission risks that exploit SARS-CoV-2 test data from an entire population. We defined the attack rate as the proportion of additional household members that tested positive, whereas the transmission risk was the proportion of secondary cases per primary case. To estimate the attack rate, we estimated the proportion of potential secondary household members who received a positive test within 14 days after the test date of the primary case. (In Appendix D, we illustrate changes over all three periods.) Figure 1 panel (a) shows that after receiving a positive test result in the household (t = 0), 36% of potential secondary cases were tested (blue) the day after the positive test result (t = 1) of the primary case was available and 13% of these 36% were positive (red).	./cache/cord-298086-pbfi5c8e.txt	./txt/cord-298086-pbfi5c8e.txt