Iji sụgharịa zapivanie otzalka iji nweta nnweta. Ntị nke

Chọta akwụkwọ nkà ihe ọmụma iji weta ụdị ejiji anụnụ anụnụ. Ihe ncheta karia n'usoro n'usoro n'usoro nke nje bacteria nke nje nje virus na-eme ka ihe nchikota nke ozo.

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