The new virus identified in the study is a recombination of the 2009 H1N1 variant and a once prevalent strain found in pigs.
In addition to stepping up surveillance, Sun says it makes sense to develop a vaccine against G4 for both pigs and humans. However, they say there is no evidence it is yet capable of being passed from person to person.
So far, it hasn't posed a big threat, but Prof Kin-Chow Chang and colleagues who have been studying it, say it is one to keep an eye on.
A study of around 340 swine workers, who came into contact with pigs as part of their work, showed that 10 per cent of the workers tested positive for the new influenza strain, G4 EA H1N1. Prof Chang works at Nottingham University in the UK. "But we must not lose sight of potentially risky new viruses", Prof Kin-Chow Chang of the UK's Nottingham University told BBC, adding that we should "not ignore" the recent discovery.
While scientists say it doesn't now pose an immediate threat, "we should not ignore it". The new strain discovered in China is similar to the swine flu with some differences.
Media reports are emerging of a new strain of flu which has the potential to become a pandemic. It is to be noted that the researchers made a decision to use ferrets because they experience similar symptoms to humans.
Researchers found that G4 viruses were able to bind to human receptors, and could replicate themselves in the cells in human airways. The swabs collected yielded 179 swine influenza viruses.
If that becomes the case, the virus becomes a problem, and so, the researchers have "called for urgent measures to monitor people working with pigs".
Nelson added to Science that given the warning, it would be ideal to produce a human G4 vaccine as the world still needs to be vigilant on other pandemics besides COVID-19.
Although it was initially feared to be a serious risk to health, H1N1 ultimately turned out to be a mild illness.
Estimates suggested one in five people around the world were infected with swine flu in the first year of the outbreak, but the mortality rate was just 0.02 per cent - around five times lower than the seasonal flu. That flu was not as awful as initially thought.
The researchers then conducted some more experiments - including on ferrets.