News
h1N1 guiDaNce oN maSS gatheriNgS
World Health organisation issues planning considerations
for pandemic
WHO has released guidance on mass gatherings during periods
of high influenza infectivity. The document, entitled “Interim
planning considerations for mass gatherings in the context of
pandemic (H1N1) 2009 influenza”, states that any decision to
proceed with a mass gathering or to restrict, modify, postpone, or
cancel the event should be based on a thorough risk assessment.
The document recommends that risk assessments should be
carried out in partnership with local and national public health
authorities, and adds that such assessments should take into
account available information about pandemic (H1N1) 2009
influenza at global, national and local levels.
The guidance also highlights some factors which the
organisation believes may be of particular relevance. These
include: • Age of participants: Since younger age groups appear to
• Influenza activity: The level of pandemic influenza activity be more affected, mass gathering comprised principally of
circulating in the community where the mass gathering is to be children and young adults may be associated with increased
held should be considered. However, it is difficult to predict transmission compared with those comprised of older age
the level of activity and which strains of influenza will be groups.
circulating very far in advance. WHO provides weekly updates • Occurrence of severe disease and health care capacity:
of pandemic activity. Although severe disease is uncommon, treatment of these
• Period of time over which the mass gathering will take place: patients is challenging and resource intensive with emergency
If the duration of the mass gathering is more than the typical departments and intensive care units experiencing a
incubation period for pandemic (H1N1) 2009 influenza (two to disproportionate burden.
three days), then the majority of event-associated cases would If the decision is made to proceed with a mass gathering, WHO
be expected to occur while the mass gathering is underway. advises that planning should consider measures to detect and
In contrast, if the duration of the event is shorter, most cases monitor event-related pandemic influenza; reduce spread of the
would likely occur after the event as people travel and return to pandemic virus; manage and treat ill persons and disseminate
their home communities. relevant public health messages.
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