With measles cases on the rise, experts emphasize the importance of a two-dose vaccination strategy. Dr. Ravi Jhaveri, a pediatric infectious disease professor at Northwestern University, compared vaccines to umbrellas: they may not completely prevent exposure but can significantly reduce risk.
Dr. Jhaveri highlighted that while the first dose of the measles vaccine provides 95% protection, "the virus is so proficient at finding the vulnerable person, we need to do better than 95%." He warned that misinformation about vaccines could lead to significant outbreaks: "It wouldn’t take much for us to have big-time national measles cases."
Despite concerns, over 90% of U.S. parents vaccinate their children annually. "We spend a lot of time talking about people who aren’t getting vaccinated," said Jhaveri. "But let’s not forget the vast majority of people who are vaccinating."
The history of measles vaccination reveals changes in dosing strategies over time. Initially introduced in 1963 with one dose, large outbreaks in subsequent decades led to the adoption of a second dose policy for better coverage.
Jhaveri explained adjustments made for convenience and efficacy: "Public health officials moved the second booster shot to age four... This is much more convenient for parents."
In outbreak settings, earlier administration of doses may be prioritized: "In certain circumstances... you can also give the vaccine earlier," noted Jhaveri.
Addressing other vaccine-preventable diseases like chickenpox and polio, Jhaveri emphasized vigilance against potential resurgences due to declining vaccination rates or exposure patterns.
Regarding polio's re-emergence threat, he stated it would require significant global changes as only Afghanistan and Pakistan currently report circulating cases.
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