id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
cord-256699-d2tf2g7f	Brochot, Etienne	Comparison of different serological assays for SARS-CoV-2 in real life	2020-08-02		.txt	text/plain	1864	68	43	In addition, more than 50 days after a positive PCR for CoV-2-SARS the proportion of positive patients seem to decrease. We For these 168 samples divided into 4 groups for which the five serological techniques were performed, we compared the number of positive samples two by two and calculated the overall percent agreement (negative and positive samples) and Kappa index ( Table 2) .	cache/cord-256699-d2tf2g7f.txt	txt/cord-256699-d2tf2g7f.txt
