Sir,
With reference to your report, "Infection milder but more widespread, study finds" (January 10), the new study from Vietnam and the Karolinska Institute in Stockholm, which concludes that there are far more human cases of mild H5N1 avian influenza than World Health Organisation tallies suggest, does not warrant rethinking the current bird flu paradigm or viewing H5N1 as a lesser threat.
Aside from the preliminary nature of these findings, two important methodological limitations in the study should be noted.
Sir,
With reference to your report, "Infection milder but more widespread, study finds" (January 10), the new study from Vietnam and the Karolinska Institute in Stockholm, which concludes that there are far more human cases of mild H5N1 avian influenza than World Health Organisation tallies suggest, does not warrant rethinking the current bird flu paradigm or viewing H5N1 as a lesser threat.
Aside from the preliminary nature of these findings, two important methodological limitations in the study should be noted.