Serum samples of 17 pregnant women with suspected rubella who presented at the Department of Microbiology, AIIMS, New Delhi, from March to May 1988 for confirmation of diagnosis were tested for rubella haemagglutination inhibiting (HAI) antibodies and rubella specific IgM antibodies by mu-capture ELISA. Ten of the 17 women were diagnosed to have acute rubella infection as they showed the presence of rubella specific IgM antibodies. Nine of these gave history of fever and rash whereas one woman remained asymptomatic. These observations suggest an increase in the incidence of rubella infection in pregnant women from March to May 1988 in Delhi.