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all these four community-acquired hcovs have been well adapted to humans and are generally less likely to mutate to cause highly pathogenic diseases, though accidents did occur for unknown reasons as in the rare case of a more virulent subtype of hcov-nl63, which has recently been reported to cause severe lower respiratory tract infection in china.
hemî wan çar civaka nasîyayî ya hcovs bo rewşeke baş hate guncandin bi meriv re û îhtimala terhrîka wan bûna sedema nexweşîyên patocênîka mêzin, kêm e, wusa rûdayên bi sedemên nedîyar nehate encamdan ji ber wan haletên kû herî dijawara cûtra bina hcov-nl63, ku di wî dawîyê de ji bo sedema hewkirina nefesîya kêma ciddi di Çîn de hate rapor kirin.