id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-313386-t2p9txlt	Naito, Yuji	Association between selective IgA deficiency and COVID-19	2020-08-21		.txt	text/plain	1694	103	51	The low infection rate contributed to the low death rate from COVID-19 in Japan, suggesting that the extremely low frequency of selective IgA deficiency may be a contributing factor. Table 1 presents the number of COVID-19 infections and deaths, populations, and frequencies of selective IgA deficiency in 19 countries. (12) As shown in Fig. 3 , there was a positive correlation between the frequency of selective IgA deficiency and the COVID-19 infection rate per 1 million population. Another important finding in this study was a strong positive correlation between the frequency of selective IgA deficiency and the prevalence of COVID-19 infection per population. The high frequency of selective IgA deficiency in the Western countries suggests that the heterogeneous genotype population is even higher, and that the number of COVID-19 infections increases proportionately, resulting in an increase in deaths. There was a strong positive correlation between the frequency of selective IgA deficiency and the COVID-19 infection rate per population.	./cache/cord-313386-t2p9txlt.txt	./txt/cord-313386-t2p9txlt.txt