Kusvibiswa kwetsika dzemasero kunogona kuve nyore nyore dambudziko rinowanzoitika mumarabhoritari etsika, dzimwe nguva zvichikonzera mhedzisiro yakakomba.Sero tsika zvinosvibisa zvinogona kupatsanurwa muzvikamu zviviri, makemikari zvinosvibisa sepakati, serum uye mvura tsvina, endotoxins, plasticiz ...
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