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The MMR vaccine isn't lifelong immunity (you're suppose get a top-up after 10 - 15 years). The average incubation period for mumps is 16 to 18 days (with a range of 10 to 25 days). Mumps is spread in the same way as colds and flu: through infected droplets of saliva that can be inhaled or picked up from surfaces and transferred into the mouth or nose. Encephalitis is very serious, if left untreated it causes problems and the main cause of death from mumps was Aseptic Meningitis (which could have up to 70% mortality rate in new borns, you've only provided the 1/10000 case which was Encephalitis), just like leaving pneumonia (probably the most common cause of coronavirus deaths) causes problems. There's no real 'mortality rate' for coronavirus as per say, as currently it's an epidemic, everyone's being treated at a hospital (safety precautions, it's new) and people are being treated with the same antibiotics to treat flu (unless it turns into pneumonia), the current 'mortality rate' is only based on who's died from it, which some countries have reported the deaths are from pneumonia, some coronavirus (the results are usually skewed anyways) and they're not taking into account the fact people aren't getting treated as there isn't enough room. It's why mortality rate is on a per country basis. It wouldn't surprise me if coronavirus has the same mortality rate as flu if it were in a controlled environment.This is objectively wrong.
Mumps is quite rare due to being part of the standard vaccination programs.
In most cases the symptoms are mild and generally don't affect respiration, like influenza.
That's why mortality from mumps is encephalitis/meningitis - not pneumonia.
It's contagious through spit and there has to be quite close contact to the sick person in order to be infected.
The incubation period is also shorter, and it lasts about a week.
To a layman this can seem similar to the coronavirus (I don't know), but there are very important differences.
The mortality rate of coronavirus could be 1% in the US but 10% in Iran.