"Today, out of 99 samples, 18 have tested positive for swine flu," said R N Das, who is a member of the five-member team constituted by the health department to review the cases.
Das maintained that there was no cause for alarm and the seasonal infection will disappear once the warmer days set in.
Samples are being sent to National Centre for Disease Control (NCDC) to confirm whether they are swine flu cases.
"We have enough medicines in stock. We are again and again instructing the 22 designated hospitals to follow the standard operating procedures for treatment of swine flu," they said.
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Also, according to the five-member committee, the H1NI virus till now has claimed not four but three lives with one of the deceased's samples having tested negative for the virus by the NCDC.
Swine influenza A (H1N1) virus spreads in the same way as the seasonal flu and even the symptoms are similar to the symptoms of regular flu which includes fever, cough, sore throat, body aches, headache, vomiting, diarrhoea, and fatigue.
"It spreads when infected people cough and then others breathe in the virus. People should avoid touching their nose and mouth after using a public tap. Mostly importantly people have to be vigilant and if they feel that they have contracted the virus, they should immediately seek medical help.
However, it can be serious for elderly or children with low immunity or people who have health complications like heart diseases, cancer, HIV, diabetes or pregnant women, elderly or children with low immunity, he added.