DRC: Polio outbreak in Congo puzzles experts

An unusually deadly outbreak of poliomyelitis (polio) in Congo has scientists scratching their heads. Close to 500 people were left paralysed and almost 200 succumbed to polio since the outbreak began in October. The viral disease killed around 42 per cent of people infected, unlike typical outbreaks that kill 5–10 per cent. And although the disease usually attacks children under five years of age, most victims in this outbreak were men aged between 15 and 25 years.