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Nearly a quarter of Delhi's population has been infected with coronavirus, according to antibody tests which suggest that millions of cases have gone undetected. 

India's capital territory has officially recorded 126,000 cases, making it one of the world's worst-hit capitals - with a higher infection rate than London or Rome, although lower than Moscow or Brasilia.  

However, the true figure could be as high as 6.5million after disease experts tested more than 20,000 people across Delhi - a region of 29million people - and found that 23.4 per cent of them had developed antibodies against Covid-19.    

 
Experts say the proportion of people infected could be even higher in slum areas where social distancing is near-impossible, and warn that any 'herd immunity' that India has developed may only last for a few months.