The 14-month-old Baby Gulnaaz from Kirti Nagar was detected with the P1 strain poliovirus, known for its propensity to cause large outbreaks.

According to government records, Gulnaaz was taken to Moti Nagar Colony Hospital on February 15 when it was found that her right limb was immobile.

“She had high fever and investigations confirmed that she has polio. Though we are yet to do any genetic analysis, it seems that that the virus has travelled from Bihar,” said a senior official with the National Polio Surveillance Programme.

Till date this year, 106 polio cases have been isolated in India but all of them have been P3 strains. This is the first P1 polio case in Delhi after August 2006. The neighbouring cities of Ghaziabad and Faridabad have been put on high alert, the official said.

“If such a case is reported from an area, what follows is an immunisation drive. The government will try to do that as soon as possible,” a Delhi government official said.

In the present case, the patient is a resident of Darbhanga jhuggis, a slum populated mostly by migrant labourers from Bihar.

Officials said Gulnaaz was administered 11 doses of polio vaccine in the last two national immunisation rounds in January and February this year.

While Delhi recorded seven cases of polio P1 virus in 2006, the state government had last year, claimed the Capital was free of the P1 virus.

However, there has been an outbreak of the dreaded P1 virus in Bihar this year with 83 cases being reported from the state. Gulnaaz’s family reportedly came to the Capital from Bihar six months back.

With focus on the polio scare in the country, particularly in Bihar and Uttar Pradesh, Finance Minister P Chidambaram allocated Rs 1,042 crore for a revised strategy on the crippling disease.

India recorded 864 cases in 2007 as against 676 cases the previous year.

The poliovirus enters the body through the mouth when people eat food or drink water contaminated with faeces.