![Pak Fights Polio on Twitter: "Do you know how #polio virus spreads?Polio is a highly contagious disease that can spread easily from person 2 person. RT to spread the msg https://t.co/oP3bKjyHjl" / Pak Fights Polio on Twitter: "Do you know how #polio virus spreads?Polio is a highly contagious disease that can spread easily from person 2 person. RT to spread the msg https://t.co/oP3bKjyHjl" /](https://pbs.twimg.com/media/C3ezrWdWIAAKEMp.jpg)
Pak Fights Polio on Twitter: "Do you know how #polio virus spreads?Polio is a highly contagious disease that can spread easily from person 2 person. RT to spread the msg https://t.co/oP3bKjyHjl" /
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Risk factors for the spread of vaccine-derived type 2 polioviruses after global withdrawal of trivalent oral poliovirus vaccine and the effects of outbreak responses with monovalent vaccine: a retrospective analysis of surveillance
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