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The percentage positive for seasonal influenza viruses increased from 5.85 per cent in the week ending January 16 to 7.29 per cent last week among respiratory specimens received by the CHP's Public Health Laboratory Services Branch. Among influenza virus detections last week, 67 per cent were A(H1N1)pdm09, 23 per cent were B and 5 per cent were A(H3N2).
"Virus characterisation studies to date have not revealed significant differences between circulating and vaccine virus strains," the spokesman added.
Turning to influenza-like illness (ILI), in the same period, the ILI consultation rate reported by sentinel private doctors rose from 55.3 ILI cases per 1 000 consultations to 69.0, while that of General Out-patient Clinics increased from 4.7 to 5.8.
The influenza-associated admission rate in public hospitals among children aged under five increased from 0.57 cases per 10 000 persons to 1.07 in the same period, while that among the elderly aged 65 or above rose from 0.10 to 0.12.
Nine ILI outbreaks in institutions/schools were recorded each last week (affecting 63 persons) and this week (56 persons) as of yesterday (January 27). In the past four weeks, outbreaks mainly occurred in primary schools (60 per cent) and kindergartens or child care centres (30 per cent).
"Virus characterisation studies to date have not revealed significant differences between circulating and vaccine virus strains," the spokesman added.
Turning to influenza-like illness (ILI), in the same period, the ILI consultation rate reported by sentinel private doctors rose from 55.3 ILI cases per 1 000 consultations to 69.0, while that of General Out-patient Clinics increased from 4.7 to 5.8.
The influenza-associated admission rate in public hospitals among children aged under five increased from 0.57 cases per 10 000 persons to 1.07 in the same period, while that among the elderly aged 65 or above rose from 0.10 to 0.12.
Nine ILI outbreaks in institutions/schools were recorded each last week (affecting 63 persons) and this week (56 persons) as of yesterday (January 27). In the past four weeks, outbreaks mainly occurred in primary schools (60 per cent) and kindergartens or child care centres (30 per cent).
