India, April 18 -- Weakening of DTP vaccine's long-term effects, outdoor air pollution and bacterial mutation being pointed out as plausible reasons for outbreak

Whooping cough, a highly contagious respiratory illness also known as 'pertussis', is making a concerning comeback across the globe. It is more common among young children and babies and can even prove to be fatal. The infection, caused by the bacteria bordetella pertussis , is difficult to detect early and mainly spreads through respiratory droplets.

Outbreaks are being reported in numerous countries including China, the Philippines, the Czech Republic, the Netherlands, the United States, and the United Kingdom. China has reported a more than 20-fold increase in whooping cough c...