Friday, 1 March, 2024
HomeNews UpdateLack of herd immunity allowing measles to spread in the US

Lack of herd immunity allowing measles to spread in the US

Measles cases in the [b]United States[/b] are at their highest levels since 2000, when the disease was declared eliminated. This year 514 cases have been reported – more than double the previous high, in 2011 – and the number isexpected to continue to climb, reports [s]The Washington Post[/s]. One reason is vaccine refusals but, the report notes, 10% of the cases occurred in vaccinated individuals. This has been attributed to lack of seroconversion – when antibodies are not created in the vaccinated person –and also the fact that when a successfully vaccinated person ages, the concentration of antibodies decreases. Until about six or seven years ago, waning immunity to measles would not have been a major concern because the US had high levels of what is called herd immunity. But, the report says, the recent string of outbreaks will continue if immunisation levels remain low.

[link url=]Full report in The Washington Post[/link]

MedicalBrief — our free weekly e-newsletter

We'd appreciate as much information as possible, however only an email address is required.