Despite expert recommendations that children continue to get regularly scheduled vaccines during the COVID-19 pandemic, rates of vaccinations decreased in several states.
Researchers looked at childhood immunization rates in Texas to see what effect the COVID-19 pandemic may have had on childhood immunizations in 2020, using data from a statewide immunization registry to determine how immunization rates changed over a 10-year period for children at four age milestones: 1 month, 5 months, 16 months, and 24 months.
The researchers, led by Tasmiah Nuzhath, a public health doctoral student at Texas A&M University, also analyzed county-level data from 2019 and 2020 to compare rural and urban locations.
The COVID-19 pandemic led to shutdowns and social distancing recommendations around the country, which in turn led to delays in obtaining routine health care due to the closing of medical facilities and perceived patient risk.
During the early months of the pandemic, some regions saw large decreases in vaccinations. New York City saw a 63% drop in the number of vaccines given to children, and Massachusetts reported a 68% decrease in April 2020. The most significant decreases around the country occurred during the first few weeks after the national emergency declaration in March 2020.
To see how much effect the pandemic had on vaccination rates in Texas, the research team analyzed data from the ImmTrac2 immunization registry from May 2010 through May 2020. The Texas Department of State Health Services (DSHS) provided the data, which included immunization records for more than 300,000 Texas children from birth to 24 months.
Their analysis found that the proportion of children who were current on recommended vaccines in the four age categories increased between 2010 and 2019. However, there were sharp decreases in vaccination between 2019 and 2020 in most categories, which the authors attributed to the COVID-19 pandemic. The decline in vaccinations was similar to those found in other states. The declines were greatest for the 5-month-old and 16-month-old groups.
The analysis of county-level data found that 5-month-old children in rural locations had greater declines in immunization rates than those living in urban areas. Researchers also found no decrease in Hepatitis B vaccines at birth.
This points to immunizations that take place in clinics or doctor’s offices as opposed to hospitals being the most affected by the pandemic. Thus, measures meant to slow the spread of COVID-19 may have had the unintended consequence of decreasing the number of children who are fully vaccinated, putting more children at risk for contracting vaccine preventable diseases.
Researchers also found that uptake of most vaccines appeared to increase prior to the pandemic between May 2010 and May 2019 with the exception of measles vaccine. MMR (measles, mumps, and rubella) coverage has been declining in Texas since 2015 and is currently below the 95% coverage level required to achieve herd immunity. The already low level of measles vaccination coverage, exacerbated by the pandemic, increases the risk of a measles outbreak in Texas and could have substantial public health consequences.
The findings of this study are in line with those focusing on other states, but the researchers note that the findings are limited by their data source. ImmTrac2 is an opt-in registry, which means that the data may not reflect the population as a whole.
However, despite this limitation, the findings point to possible disruptions in vaccination services as well as disparities between rural and urban communities. These results indicate that there is a need for better targeted public health communication to address perceived risks and for improved vaccination infrastructure to help overcome barriers to vaccination in rural areas.
The research appears in the journal Vaccine. Additional researchers are from the Texas Children’s Hospital Center for Vaccine Development and Baylor College of Medicine, the University of San Francisco School of Nursing and Health Professions, the UCLA Fielding School of Public Health, and Texas A&M.
Source: Texas A&M University