เชื้อจุลินทรีย์, แบคทีเรีย, เชื้อโรค, การติดเชื้อ, ไวรัส, ทางการแพทย์, จุลชีววิทยา, ชีววิทยา, สุขภาพ
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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