Among PW reporting recent or current undifferentiated fever/rash syndrome at any point in time, the acute illness episode will be characterized in greater detail. PW with suspected ZIKV infection (i.e. meeting the Pan American Health Organization (PAHO) clinical case definition) during pregnancy will be managed according to national protocols. Irrespective of symptoms, pregnant women will be followed prospectively and revisited at birth (or after abortion) for a detailed documentation of the outcome of their pregnancy.