The child has been kept in isolation at the Kasturba Hospital in Mumbai. (PTI representative photo)

A three-year-old girl tested positive for coronavirus in Mumbai on Monday. Both her parents have also tested positive for the viral infection.

According to doctors at Mumbai's Kasturba Hospital, the child's father, 37, has a history of travel to the United States. He tested positive for Covid-19 earlier and was kept in isolation at the Kasturba Hospital. His daughter and wife, 33, were also kept in isolation and later tested positive.

On Monday, six new coronavirus cases were diagnosed in Maharashtra, taking the total number of Covid-19 positive cases in the state to 39 -- the highest in India.

In a bid to prevent the spread of coronavirus, the state has stopped all examinations and instructed college and school staff to work from home till March 25.

The profiles of the five new patients tested positive for Covid-19 at Kasturba Hospital are:

One female patient from Mumbai aged 44 from Mumbai's Bhandup area. She has a travel history to Lisbon, Portugal and landed in Mumbai on March 13. She is admitted along with one high-risk relative. Authorities have conducted a community survey and identified two low-risk contacts and kept them under 14 day-surveillance.

Two patients are the wife and daughter of a patient from Kalyan, aged 37, with travel history to the United States.

Two male patients in their forties from Navi Mumbai. They had travelled to the Philippines and landed in Mumbai on March 2. These two were among a group of 10 people who had travelled to the Philippines.

Authorities have said that the next 14 days are crucial in terms of epidemic stages.

"We are between stage 1 and stage 2. We are trying to prevent the spread from reaching stage 3 for which we have to take precautions like quarantine, contact tracing, mass awareness and to be vigilant," said Dr Daksha Shah, deputy health officer.

Maharashtra government creates a 3-layer surveillance strategy

Given the high number of coronavirus cases in the state, the Maharashtra government has now created three groups of potential cases based on the risk of contraction of the disease.

1. A category: Those who have been screened at airports and have been showing symptoms. These individuals have been straight away taken to the Kasturba Hospital for quarantine.

2. B category: Those who are likely to get infected or prone to get infected will be kept in isolation facilities and they are being monitored. Their samples will be taken and they will be discharged on doctors' orders. They are expected to self-isolate and a local medical officer will keep track of them regularly.

3. C category: Those who haven't shown any symptoms and have been asked to go home to follow self-isolation. However, they will also remain under surveillance. At present, around 1,000 such people are under surveillance in Mumbai. Even the local municipal/collector offices have received the list of c category people from various entry points in India.