https://sci.mu.edu.iq/%d8%ad%d9%84%d9%82%d8%a9-%d9%86%d9%82%d8%a7%d8%b4%d9%8a%d8%a9-%d8%a8%d8%b9%d9%86%d9%88%d8%a7%d9%86-classification-of-infective-microorganisms-%d8%ad%d8%a7%d8%b6%d8%b1-%d9%81%d9%8a%d9%87%d8%a7-%d8%a7/