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Short answer: yes, the updated fall vaccines will work against the latest variant. The XEC variant is poised to surpass the most recent dominant strain, KP.3.1.1, in the next few weeks. But it doesn’t cause more severe illness or have any particularly drastic mutations - it’s just out-competing the other variants, as so many have since the original SARS-CoV-2 virus was first identified. The updated fall vaccines are expected to work well against XEC, especially in terms of preventing hospitalizations and deaths. The window of protection has gotten shorter over time, but that doesn’t mean that the updated vaccines don’t work. They provide a few months of protection against getting COVID and work particularly well to prevent serious illness.
Source: SF Chronicle
Yes, people can test positive on rapid at-home tests for weeks, though it’s not very common. Most people test negative after 6 or 10 days at most, so this is relatively rare (especially when you consider how few people are testing overall). Our best guess in these cases is that someone is actually still contagious when they’re testing positive on rapid tests for a long period of time. As long as their symptoms have improved and they’re fever-free for at least 24 hours without fever-reducing medication, they can return to work - though it’s recommended that they wear a mask for 5 more days from their most recent positive test or until they test negative.
This is a fascinating read, especially for our clients that require physical exams for work. Fixing pulmonary function tests that falsely assume genetic differences based on race will have a lot of knock-on effects, including an adjustment period where some people may be excluded from work that weren’t before.