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. 2020 Jun 26;15(6):e0235306.
doi: 10.1371/journal.pone.0235306. eCollection 2020.

Exploring the young demographic profile of COVID-19 cases in Hong Kong: Evidence from migration and travel history data

Christian Joy Pattawi Cruz  1 , Rachel Ganly  2 , Zilin Li  1 , Stuart Gietel-Basten  1   2
Affiliations

Exploring the young demographic profile of COVID-19 cases in Hong Kong: Evidence from migration and travel history data

Christian Joy Pattawi Cruz et al. PLoS One. .

Abstract

This paper investigates the profile of COVID-19 cases in Hong Kong, highlighting the unique age structure of confirmed cases compared to other territories. While the majority of cases in most territories around the world have fitted an older age profile, our analysis shows that positive cases in Hong Kong have been concentrated among younger age groups, with the largest incidence of cases reported in the 15-24 age group. This is despite the population's rapidly aging structure and extremely high levels of population density. Using detailed case data from Hong Kong's Centre for Health Department and Immigration Department, we analyze the sex and age distribution of the confirmed cases along with their recent travel histories and immigration flows for the period January to April 2020. Our analysis highlights Hong Kong's high proportion of imported cases and large overseas student population in developing COVID-19 hotspot areas such as the United Kingdom. Combined with community action and targeted and aggressive early policy measures taken to contain the virus, these factors may have contributed to the uniquely younger age structure of COVID-19 cases in the city. Consequently, this young profile of confirmed cases may have prevented fatalities in the territory. Recent research has highlighted the importance of a demographic approach to understanding COVID-19 transmission and fatality rates. The experience in Hong Kong shows that while an older population age structure may be important for understanding COVID-19 fatality, it is not a given. From a social science perspective at least, there is 'no easy answer' to why one area should experience COVID-19 differently from another.

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Conflict of interest statement

The authors have declared that no competing interests exist.

Figures

Fig 1
Fig 1. Age and sex distribution of confirmed COVID-19 cases Hong Kong (n = 1,017, as of April 16, 2020).
Data Source: Hong Kong Center for Health Protection, Department of Health.
Fig 2
Fig 2. Distribution of confirmed COVID-19 cases by transmission type and by age groups: Hong Kong (n = 1,017, as of April 16, 2020).
Data Source: Hong Kong Centre for Health Protection, Department of Health.
Fig 3
Fig 3. Number of cumulative confirmed cases by age groups: Hong Kong (n = 1,017, January 23 to April 16, 2020).
Data Source: Hong Kong Center for Health Protection, Department of Health.
Fig 4
Fig 4. Number of arrivals (primary axis) and daily confirmed cases by residential status (secondary axis: Hong Kong (n = 1,017, January 23 to April 16, 2020 [arrivals data only available from January 24, 2020]).
Data Source: Hong Kong Immigration Department; Hong Kong Center for Health Protection, Department of Health.
Fig 5
Fig 5. Population pyramid of Hong Kong, 2016.
Data Source: 2016 Population By-census Office, Census and Statistics Department.
See this image and copyright information in PMC

References

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