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Laboratory assistants from the Institute of Serology prepare to collect the sewage samples from a sewage in Shyam Lal lane in Kolkata to monitor the polio virus in urban Bengal.
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Sanjit Das
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End of Polio
Laboratory assistants from the Institute of Serology prepare to collect the sewage samples from a sewage in Shyam Lal lane in Kolkata to monitor the polio virus in urban Bengal.