But 28 of these patients have already recovered or have been discharged after testing negative for COVID-19 in subsequent tests, the health department said.
Notably, the man, who has no symptoms, had taken three doses of Pfizer's coronavirus vaccine, it added.
One of them, a 70- year old female, whose samples were collected on December 5 at a private laboratory in Mahadevapura, had a travel history to Delhi.
The three from non-risk country are from Kenya, where the vaccine levels are extremely low due to what WHO calls as vaccine inequity.
A 24-year-old woman from Kenya and a 23-year-old man from Somalia, who landed in Hyderabad on December 12, have tested positive for the variant, a Telangana health official said
The bulletin said one of those who have been infected with Omicron had travelled to Bengaluru, while the others had visited New Delhi.
Satara district civil surgeon said the samples of all the four have been sent to the National Institute of Virology in Pune to ascertain if they have been infected with the Omicron variant of Covid.
Earlier, three cases of the Omicron variant infection were reported from Jamnagar in Gujarat, including a 72-year-old NRI man who had returned from Zimbabwe, his wife and brother-in-law.
With these two cases -- one from Latur and the other from Pune -- the tally of patients infected with the newly discovered variant of the coronavirus rose to 20, it added.
Currently, the identification or screening for Omicron is done worldwide using next-generation sequencing-based methods which require over three days.
Health minister Veena George said Kerala has followed the centre’s guidelines and all arrangement were in place to deal with the situation.
Director of Public Health Dr Niranjan Mishra said 1,286 foreign returnees registered their names in the Air Suvidha portal.
The cases confirmed in Mumbai are three males aged 25, 37 and 48 years, all with a recent travel history to the UK, South Africa and Tanzania.
According to the Indian Council of Medical Research, Omicron is not posing burden on the healthcare system yet clinically but the vigil has to be maintained.
Top officials of the health ministry informed a parliamentary panel that there are 23 cases of the omicron variant across the country, and authorities are closely monitoring the situat