That said, it is still possible to get the flu, (a different circulating strain), but the chances are much less likely.

FORBES: 2013 Flu Season: How to Protect Yourself

Mr Reddy stressed that there were no signs of a tamiflu-resistant strain of H1N1 circulating in the community.

BBC: Tamiflu

People who live in institutions, such as a university, school or hospital, are particularly prone to getting any new strain that is circulating.

BBC: The flu virus that nearly killed me

N1 strain of bird flu that is currently circulating in Asia.

ECONOMIST: Devastation in Kashmir

This is in contrast to seasonal H1N1 flu where a Tamiflu resistant strain emerged last year and is now widely circulating.

BBC: Tamiflu

Except for hospitalized patients, others with flu-like symptoms are not being tested to confirm they have swine flu, since "virtually all of the influenza that's circulating right now in the United States is the 2009 H1N1 strain, " Schuchat said.

CNN: Feds update H1N1 antivirals guidelines

It said a strain of polio (WPV1) found in China was genetically linked with the type now circulating in Pakistan.

BBC: Polio strain spreads to China from Pakistan