Dear editor, the recent report on “influenza infection in ICU” is very interesting1. Pérez-Carrasco et al. concluded that “influenza infection screening should be considered in all SARI patients1.” Indeed, influenza is a big problem worldwide and the infection can be seen at any time and place. The epidemiology of influenza in different setting is different and there is also seasonal change. The present report also showed that “influenza SARI was mainly caused by subtype A(H1N1)pdm09 and A(H3N2) in post-pandemic seasons, and no differences were observed in ILI and mortality rate compared with a pandemic season1.” Based on this data, an interesting observation is the existence of circulation of subtype A(H1N1)pdm09. In fact, after the pandemic, it is no doubt that the incidence of subtype A(H1N1)pdm09 decreases but it should not it can still be seen at a high rate2. In additional, the molecular survey also showed the continuous mutation observation in the virus3. Hence, the continuous surveillance is still required4. Finally, it should be noted that the physician in charge should not forget the other viral infections that can be seen at the same time of existence of influenza virus5.
Conflict of interestNo.
