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The United States (US) has reported an increase in the circulation of influenza virus that began in December 2012, and has continued into the new year (2013). This is an earlier start (2 months) to the influenza season in the US compared with other years, excluding the pandemic in 2009-2010.
The media has reported high Influenza Like Illness (ILI) activity in 29 states of the US with Texas and New York City badly affected. CDC has recorded 'widespread' influenza in 41 states; this is the highest level in their surveillance system.
The predominant strain of virus this season has been influenza A (H3N2) followed by influenza B (Yamagata and Victoria lineages). There are four strains circulating at present, three of which are included in this seasons northern hemisphere influenza vaccine.
(Via PAHO - accessed 17/01/13)
(Via Examiner - accessed 17/01/13)
Advice for Travellers
Travellers considered to be at increased risk from influenza according to DH Risk Groups should ensure that they have received influenza vaccine from their GP. Other travellers may wish to receive influenza vaccine on a private basis from their GP or local Travel Clinic.
Travellers should be aware of the high level of ILI activity in the US and that transmission is through close personal contact:
