ما هو الخُنَاق أو الديفتيريا؟
خناق
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"Antitoxin dars 1735 and 1740." The William and Mary Quarterly, 3rd Ser., Vol 6, No 2. p.338.
Shulman ST, "The History of Pediatric Infectious Diseases", Pediatric Research Vol. 55, No. 1 (2004).