Commonground
Senior Moderator
Excerpts:
Local Situation of Influenza Activity (as of Dec 10, 2025)
Hong Kong is currently in the influenza season. Surveillance data showed that the local influenza
activity continued to increase over the past two weeks.
Influenza can cause serious illnesses in high-risk individuals and even healthy persons. Given that
seasonal influenza vaccines are safe and effective, all persons aged 6 months or above except
those with known contraindications are recommended to receive influenza vaccine to protect
themselves against seasonal influenza and its complications, as well as related hospitalisations
and deaths.
2025/26 Seasonal Influenza Vaccination (SIV) Programmes, including the SIV School Outreach
Programme and the Residential Care Home Vaccination Programme, have been commenced on
September 25, 2025, and the Vaccination Subsidy Scheme has also been commenced on
September 22, 2025. Eligible high-risk groups can receive a free or subsidised SIV through various
vaccination programmes. The public may visit the CHP's Vaccination Schemes page for more
details of the vaccination programmes (https://www.chp.gov.hk/en/features/17980.html).
Apart from getting influenza vaccination, members of the public should always maintain good
personal and environmental hygiene.
For the latest information on seasonal influenza and its prevention, please visit the Centre for
Health Protection's Seasonal Influenza page
(http://www.chp.gov.hk/en/view_content/14843.html).
Influenza-like-illness surveillance among sentinel family medicine clinics and
sentinel private medical practitioner clinics, 2021-25
In week 49, the average consultation rate for influenza-like illness (ILI) among sentinel family
medicine clinics (FMC) was 10.8 ILI cases per 1,000 consultations, which was higher than 10.2
recorded in the previous week (Figure 2.1, left). The average consultation rate for ILI among sentinel
private medical practitioner (PMP) clinics was 46.8 ILI cases per 1,000 consultations, which was lower
than 49.5 recorded in the previous week (Figure 2.1, right).
[charts]
Laboratory surveillance, 2021-25
Among the 9,344 respiratory specimens* received in week 49, 711 (7.61%) were tested positive for
seasonal influenza A or B viruses. Among the subtyped influenza detections, there were 23 (3%)
influenza A(H1), 659 (95%) influenza A(H3) and 13 (2%) influenza B viruses. The positive percentage
(7.61%) was above the baseline threshold of 4.94%, and was higher than 6.48% recorded in the
previous week (Figure 2.2).
Influenza-like illness outbreak surveillance, 2021-25
In week 49, 76 ILI outbreaks occurring in schools/institutions were recorded (affecting 517 persons),
as compared to 72 outbreaks recorded in the previous week (affecting 632 persons) (Figure 2.3). The
overall number was at the medium intensity level currently (Figure 2.4*). In the first 4 days of week
50 (Dec 7 to 10), 29 ILI outbreaks in schools/institutions were recorded (affecting 174 persons). Since
week 36, 1,170 outbreaks were recorded (as of December 10).
Influenza-associated hospital admission rates in public hospitals based on
discharge coding, 2021-25
In week 49, the overall admission rate in public hospitals with principal diagnosis of influenza was
0.45 (per 10,000 population) as compared to 0.36 recorded in the previous week (Figure 2.6). It was
above the baseline threshold of 0.27 but was at the low intensity level (Figure 2.7*). ...
Surveillance for intensive care unit (ICU) admission/death with laboratory confirmation of influenza among adult patients (Aged 18 years or above)
In week 49, 22 adult cases of ICU admission/death with laboratory confirmation of influenza
(including 12 deaths) were recorded, as compared to 22 cases (including 17 deaths) in the
previous week. Among the 22 adult cases, 16 were not known to have received the 2025/26
seasonal influenza vaccine (SIV). In the first 4 days of week 50 (Dec 7 – 10), 13 cases were
recorded, in which 7 of them were fatal.
... https://www.chp.gov.hk/files/pdf/covid_flux_week49_11_12_2025_eng.pdf
Local Situation of Influenza Activity (as of Dec 10, 2025)
Hong Kong is currently in the influenza season. Surveillance data showed that the local influenza
activity continued to increase over the past two weeks.
Influenza can cause serious illnesses in high-risk individuals and even healthy persons. Given that
seasonal influenza vaccines are safe and effective, all persons aged 6 months or above except
those with known contraindications are recommended to receive influenza vaccine to protect
themselves against seasonal influenza and its complications, as well as related hospitalisations
and deaths.
2025/26 Seasonal Influenza Vaccination (SIV) Programmes, including the SIV School Outreach
Programme and the Residential Care Home Vaccination Programme, have been commenced on
September 25, 2025, and the Vaccination Subsidy Scheme has also been commenced on
September 22, 2025. Eligible high-risk groups can receive a free or subsidised SIV through various
vaccination programmes. The public may visit the CHP's Vaccination Schemes page for more
details of the vaccination programmes (https://www.chp.gov.hk/en/features/17980.html).
Apart from getting influenza vaccination, members of the public should always maintain good
personal and environmental hygiene.
For the latest information on seasonal influenza and its prevention, please visit the Centre for
Health Protection's Seasonal Influenza page
(http://www.chp.gov.hk/en/view_content/14843.html).
Influenza-like-illness surveillance among sentinel family medicine clinics and
sentinel private medical practitioner clinics, 2021-25
In week 49, the average consultation rate for influenza-like illness (ILI) among sentinel family
medicine clinics (FMC) was 10.8 ILI cases per 1,000 consultations, which was higher than 10.2
recorded in the previous week (Figure 2.1, left). The average consultation rate for ILI among sentinel
private medical practitioner (PMP) clinics was 46.8 ILI cases per 1,000 consultations, which was lower
than 49.5 recorded in the previous week (Figure 2.1, right).
[charts]
Laboratory surveillance, 2021-25
Among the 9,344 respiratory specimens* received in week 49, 711 (7.61%) were tested positive for
seasonal influenza A or B viruses. Among the subtyped influenza detections, there were 23 (3%)
influenza A(H1), 659 (95%) influenza A(H3) and 13 (2%) influenza B viruses. The positive percentage
(7.61%) was above the baseline threshold of 4.94%, and was higher than 6.48% recorded in the
previous week (Figure 2.2).
Influenza-like illness outbreak surveillance, 2021-25
In week 49, 76 ILI outbreaks occurring in schools/institutions were recorded (affecting 517 persons),
as compared to 72 outbreaks recorded in the previous week (affecting 632 persons) (Figure 2.3). The
overall number was at the medium intensity level currently (Figure 2.4*). In the first 4 days of week
50 (Dec 7 to 10), 29 ILI outbreaks in schools/institutions were recorded (affecting 174 persons). Since
week 36, 1,170 outbreaks were recorded (as of December 10).
Influenza-associated hospital admission rates in public hospitals based on
discharge coding, 2021-25
In week 49, the overall admission rate in public hospitals with principal diagnosis of influenza was
0.45 (per 10,000 population) as compared to 0.36 recorded in the previous week (Figure 2.6). It was
above the baseline threshold of 0.27 but was at the low intensity level (Figure 2.7*). ...
Surveillance for intensive care unit (ICU) admission/death with laboratory confirmation of influenza among adult patients (Aged 18 years or above)
In week 49, 22 adult cases of ICU admission/death with laboratory confirmation of influenza
(including 12 deaths) were recorded, as compared to 22 cases (including 17 deaths) in the
previous week. Among the 22 adult cases, 16 were not known to have received the 2025/26
seasonal influenza vaccine (SIV). In the first 4 days of week 50 (Dec 7 – 10), 13 cases were
recorded, in which 7 of them were fatal.
... https://www.chp.gov.hk/files/pdf/covid_flux_week49_11_12_2025_eng.pdf