The US is experiencing a surge in measles cases, prompting concerns over the wear-off of vaccine effectiveness. Those who received their measles vaccination decades ago may no longer be fully protected.
Measles can spread easily among those who haven’t been infected or vaccinated, with up to 90% transmission rate. The first measles vaccine was introduced in 1968 and a more effective MMR vaccine followed in 1971. Prior to widespread vaccination, measles cases were reported in multiple US states.
Health experts warn of waning immunity due to limited data on booster shots. A two-dose series is recommended by health authorities for lifelong immunity, with most people retaining around 97% effectiveness against the virus.
Adults who received vaccines between 1963 and 1968 should check their vaccination history. Natural immunity from those born before 1957 may be sufficient.
Studies show that antibody levels decrease over time, but actual cases remain rare in fully vaccinated individuals. Medical experts emphasize caution, suggesting blood tests to check antibody levels or consulting with a doctor for personalized advice.
Source: https://www.foxnews.com/health/measles-vaccines-given-long-ago-could-less-effective-now-doctors-say