This story was originally featured on Fortune.com
The move brings the UK into line with other countries which already offer routine varicella vaccination, including Germany, Canada, Australia and the US.
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The A/D bits exist entirely for the operating system's benefit. The Accessed bit tells the OS which pages have been recently used, enabling page replacement algorithms to choose pages to evict when memory runs low. The Dirty bit tells the OS which pages have been modified and must be written back to disk before eviction; clean pages can simply be discarded and re-read from disk later.