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Sentinel Surveillance of Infectious Diseases at Child Care Centres/Kindergartens(CCC/KG)

Sentinel Surveillance of Infectious Diseases at Child Care Centres/Kindergartens(CCC/KG)

The Centre for Health Protection (CHP) of the Department of Health (DH) has established several surveillance systems in Hong Kong to monitor communicable disease activity at the community and public and private healthcare facilities.  With the participation of different partners, CHP will have a more comprehensive picture of the situation of communicable diseases.  The sentinel surveillance system based at CCC/KG is one of the surveillance systems.

This weekly update outlines the data provided by CCC/KG participating in the "Sentinel Surveillance of Infectious Diseases at Child Care Centres/Kindergartens". This update aims at informing the public of community-wide trends of infectious disease based on inference from the collected data, and does not represent the situation at any particular CCC/KG or geographic area.

Download sentinel surveillance infectious diseases data in Child Care Centres/Kindergarten (CCC/KG) weekly report (in Excel format)

I. Weekly Overview

Week 2 (8/1 – 12/1)
According  to  the  recent  data  reported  by  sentinel  CCC/KGs:
-  The  activity  of  diarrhoea  has  decreased  and  the  activity  of  vomiting  remained  at  high  level;
-  The  activities  of  cough,  hand,  foot  and  mouth  disease  and  fever  remained  at  baseline  level.

Year 2017/2018 Week 2 Week 1 Week 52 Week 51
Surveillance period 8/1 - 12/1 1/1 - 5/1 25/12 - 29/12 18/12 - 22/12
Number of children (CCC/KG) under surveillance 23587(104) 21191(97) - 14600(70)
a) Surveillance of Symptoms
Percentage of CCC/KG with children affected by fever 57.69 70.10 - 48.57
Percentage of CCC/KG with children affected by cough 64.42 52.58 - 48.57
Percentage of CCC/KG with children affected by diarrhoea 12.50 17.53 - 10.00
Percentage of CCC/KG with children affected by vomiting 23.08 20.62 - 7.14
b) Surveillance of Hand, Foot and Mouth Disease
Percentage of CCC/KG with HFMD cases 0.00 3.09 - 2.86
c) Surveillance of Absenteeism due to Sickness
Average rate of absenteeism due to sickness 3.40 2.42 - 2.69

Remarks: 
(1)  As  most  of  the  CCC/KGs  were  on  Christmas  holiday  in  week  52,  sentinel  surveillance  report  of  the  week  was  suspended.
(2  )  The  CHP  of  DH  monitors  the  overall  activity  of  common  infectious  diseases  through  a  series  of  surveillance  systems.  The  overall  activity  of  acute  gastroenteritis  has  increased.  The  overall  activity  of  hand,  foot  and  mouth  disease  is  at  baseline  level.  Hong  Kong  has  entered  the  2017/18  winter  influenza  season  and  the  overall  seasonal  influenza  activity  has  continued  to  increase  in  the  past  week.

II. Surveillance of symptoms

1) Fever
Weekly chart for occurrence of fever in sentinel CCC/KG, 2017-2018.  The activity of fever in week 2 was at baseline level.

2) Cough
Weekly chart for occurrence of cough in sentinel CCC/KG, 2017-2018.  The activity of cough in week 2 was at baseline level.

3) Diarrhoea
Weekly chart for occurrence of diarrhoea in sentinel CCC/KG, 2017-2018.  The activity of diarrhoea in week 2 has decreased.

4) Vomiting
Weekly chart for occurrence of vomiting in sentinel CCC/KG, 2017-2018.  The activity of vomiting in week 2 was at high level.

III. Surveillance of Hand, Foot and Mouth Disease

Weekly chart for surveillance of hand, foot and mouth disease in sentinel CCC/KG, 2017-2018.  The activity of hand, foot and mouth disease in week 2 was at baseline level.

IV. Surveillance of Absenteeism due to Sickness

Weekly chart for surveillance of absenteeism due to sickness in sentinel CCC/KG, 2017-2018.  The average rate of absenteeism due to sickness in week 2 was 3.40%.

Methodology

  1. On each operating day, sentinel CCC/KG record the number of absentees due to sickness (data is not collected on days when a CCC/KG is closed due to public holiday, bad weather or other reasons). The total number of absentees due to sickness among all sentinel CCC/KG is divided against the total number of children in attendance to get the gross daily rate of absenteeism. The rates for each day of the week are then averaged to get the week's "Average rate of absenteeism due to sickness".
  2. In each week, sentinel CCC/KG record the presence of cases of Hand, Foot and Mouth Disease (HFMD). CHP calculates the total number of CCC/KG with cases of HFMD, and based on the total number of CCC/KG submitting reports, works out the "Percentage of CCC/KG with cases of HFMD".
  3. Every Wednesday, sentinel CCC/KG record the number of absentees who are showing symptoms of fever, cough, diarrhoea and vomiting. The numbers are reported to CHP at the end of the week (data is collected on the next operating day when a CCC/KG is closed due to public holiday, bad weather or other reasons). Based on the submitted data, CHP works out the "Percentage of CCC/KG with children affected by symptom" for the week.