Tens of thousands of doses being ordered to give immunity against deadly H5N1 virus - though risk to humans is still classed as 'low'
However, the move marks a stepping-up of readiness for a possible new pandemic if the virus makes the genetic leap to human-to-human transmission. The government’s latest assessment of avian influenza says the risk of bird flu to the human population may have risen from level 3, where there is transmission between mammals that is either limited or driven by intensive farming, such as in the case of mink, to level 4, under which there is “sustained and/or multispecies mammalian outbreaks; increasing human zoonotic cases or limited person-to-person spread, linked to zoonotic exposures”.
While these animals would have been infected by birds close by, there was some evidence that the virus was spreading between the mammals. If this so-called mammalian adaptation could occur, scientists were concerned that a further evolution, to spread between humans, could take place. The UK government agency risk assessment still classes a level 5 event – outbreaks among humans not linked to contact with infected birds or animals – as between highly unlikely and unlikely .
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