Epidemiology of a workplace measles outbreak dominated by modified measles cases at Kansai international airport, Japan, during august-september 2016

Changes in childhood vaccination during the coronavirus disease 2019 pandemic in Japan

Background

The coronavirus disease 2019 (COVID-19) pandemic has greatly affected daily life. COVID-19 often causes asymptomatic or mild disease in children; however, delayed routine childhood immunization is a concern, as it could increase the risk of vaccine-preventable disease. No study has evaluated the status of childhood vaccinations in Japan during the COVID-19 pandemic.

Methods

This retrospective observational study evaluated the number of vaccine doses administered to children in 4 Japanese cities (2 cities in the Tokyo metropolitan area and 2 cities far from Tokyo) during the period from 2016 to 2020. Vaccine doses administered between January and September 2020 during the COVID-19 pandemic were compared, by month, with those given during 2016–2019. Age-stratified demographic data were collected to determine whether factors other than change in the child population over time affected vaccination trends.

Results

In all cities the decrease in vaccine doses administered was most apparent in March and April 2020, i.e., just before or coincident with the declaration of a nationwide COVID-19 emergency on April 7, 2020. The decrease started as early as February in the Tokyo metropolitan area. As child age increased, the decrease became more apparent. Before the lift of national emergency on May 25, catch-up of the vaccination was observed in all age groups in all cities. Vaccine doses persistently increased in older age groups but not in infants. The overall vaccination trends did not differ significantly among the 4 cities.

Conclusions

The COVID-19 pandemic significantly affected routine childhood immunization in Japan. Thus, a nationwide electronic surveillance system and announcements for guardians to encourage timely routine immunization are warranted.

Progress of public health policy regarding global infectious diseases over the past decade in Japan

This article aims to examine progress of public health policy regarding global infectious diseases over the past decade in Japan.

A narrative review was conducted, overviewing items of the Infectious Disease Committee and the Tuberculosis Committee of the Ministry of Health, Labour and Welfare between 2010 and 2019.

The mean value of items discussed in each meeting were 9.7 items. Among these items, these committees have discussed about countermeasures in terms of reduced burden of indigenous infectious diseases such as measles, rubella and pertussis, and increased risk of imported infectious diseases such as Ebola virus disease, Middle East Respiratory Syndrome, plague, avian influenza, pandemic influenza and tuberculosis.

These changes regarding infectious diseases lead to loss of target population, difficulty of early detection, and market failure in old and new antibiotics and others, which requires challenge to scattered at-risk targets, effort to training and awareness, and creation of novel public health policy for research and development as well as production and supply. Over the past decade, public health policy regarding global infectious diseases have been one of the key targets under the triangle of global infectious disease, and recent experience of Coronavirus disease 2019 will further prioritize it in Japan. However, the principles of public health policy are globally vulnerable in the Post-Corona era, which can lead to the collapse of democratic way. To combat global infectious diseases without going off the road, we need to learn about the past history of public health policy.

Childhood vaccinations: Hidden impact of COVID-19 on children in Singapore

Although the direct health impact of Coronavirus disease (COVID-19) pandemic on child health is low, there are indirect impacts across many aspects. We compare childhood vaccine uptake in three types of healthcare facilities in Singapore - public primary care clinics, a hospital paediatric unit, and private paediatrician clinics - from January to April 2020, to baseline, and calculate the impact on herd immunity for measles. We find a 25.6% to 73.6% drop in Measles-Mumps-Rubella (MMR) uptake rates, 0.4 - 10.3% drop for Diphtheria-Tetanus-Pertussis-inactivated Polio-Haemophilus influenza (5-in-1), and 8.0-67.8% drop for Pneumococcal conjugate vaccine (PCV) across all 3 sites. Consequent herd immunity reduces to 74-84% among 12-month- to 2-year-olds, well below the 95% coverage that is protective for measles. This puts the whole community at risk for a measles epidemic. Public health efforts are urgently needed to maintain efficacious coverage for routine childhood vaccines during the COVID-19 pandemic.