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H1N1 has emerged as the dominant virus strain, differing significantly from seasonal influenza. With large populations now susceptible, vulnerable groups face heightened risks of severe illness, hospitalization, and death. This strain poses considerable challenges to health services, particularly in the developing world. An excessive response to the pandemic can create difficulties in assessing its severity. This overview discusses the implications of H1N1, population susceptibility, and the importance of effective health strategies to manage the outbreak.
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Freedom from Want: The H1N1 • H1N1 now the dominant virus strain • Not the same as seasonal influenza • Large populations susceptible to infection • Vulnerable groups at risk • Higher risk of hospitalization and death: health services challenged • Implications for the developing world • Dangers of an excessive response: difficulties to grade pandemics by severity. Sources: WHO/ European Center for Disease Prevention and Control
Clinicalsymptoms Asymptomatic Seasonal influenza compared to pandemic — proportions of types of cases Deaths Requiring hospitalisation Clinicalsymptoms Deaths Requiring hospitalisation Asymptomatic Seasonal influenza Source: ECDC Pandemic
Pandemic Influenza PhasesH1N1:Phase 6 Source: WHO
