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| ====Control==== | | ====Control==== |
| + | *Recovered animals show immunity ONLY to the subtype of first exposure, and even this is relatively short-lived |
| + | *Re-exposure to the original serotype after immunity as waned will still result in virus excretion, even without clinical symptoms |
| + | *Infection by a second serotype will result in clinical disease |
| + | *For these reasons, '''vaccination is not practiced''' in the UK |
| + | **Further, vaccination would mean a loss of meat export markets |