A few days after the new moon phase, the Moon will be visible again in a phase that lasts until the first quarter, called waxing crescent moon. The initial period, just after the Moon becomes visible, is sometimes called new moon, although it has another definition.
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a) Agent : The causative agents is the polioviruses which have three serotypes 1,2 and 3. Most outbreaks of paralytic polio are due to tpye-1 virus. Polio virus can survive for long periods in the external environment. In a cold environment, it can live in water for 4 months and in faeces for 6 months. It is therefore well-adapted for the faecal-oral route of transmission.