Ubwoko bwa virusi ya selile yigisha kandi ifatika igikinisho gikinisha
Muri iki gihe isi yihuta kandi itwarwa n’ikoranabuhanga, ni ngombwa cyane gushakisha uburyo bushya kandi bushishikaje bwo kwigisha abana.Twumva ingorane ababyeyi nabarezi bahura nazo mugihe bigisha ubumenyi bukomeye siyanse.Niyo mpamvu twishimiye gushyira ahagaragara virusi PVA, urutonde rwibikinisho bikomatanya bihuza imyidagaduro nibisobanuro byuburezi, bituma abana bamenya virusi muburyo bushimishije kandi busabana.