Recent studies reveal that the measles virus infiltrates immune cells, effectively erasing their memory and leaving individuals susceptible to other diseases.
The World Health Organization reports a more than 280% global surge in measles cases since 2018. Beyond acute symptoms, two new studies confirm the virus disrupts immune memory, exposing patients to secondary infections.
Scientists have long known measles targets the immune system, reducing white blood cell counts that later recover. Yet, immunocompromise can persist for years. These studies shed light on this phenomenon, termed "immune amnesia."
In the first study, researchers analyzed blood samples from 82 unvaccinated Dutch children during the 2013 measles outbreak, with 77 infected. They compared pre- and post-infection samples to track immune changes.
Focus was on B cells, which produce antibodies to neutralize pathogens and retain memory for future encounters. Post-infection, children lost many B cells specific to common infections. While they partially recovered after about 45 days, these new cells were far less effective.
The second study used VirScan to profile antibodies in children's blood before and after measles. Results showed a loss of 11% to 72% in antibody diversity, erasing much of the immune memory.
Some memory may recover through re-exposure to pathogens, effectively re-training the immune system. Healthy individuals might manage this, but vulnerable or immunocompromised patients face greater risks. "Getting bombarded by multiple infections at once could be particularly devastating," the researchers warn.
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