The replies here seem to be ignoring the point I was making, so I guess I was unclear. I'm going to try once more, hopefully this helps:
The effects of the virus at play are irrelevant... long term, short term, sniffles, death. None of that matters to the topic of moral obligation. Only contagion matters, so let's take two opposing mechanistic scenarios:
1 - Reduced infectiousness (what we expect)
Person A getting the vaccine reduces the chance they will spread it to Person B if exposed and/or infected.
2 - Reduced symptoms (counterintuitive)
Person A getting the vaccine still gets infected and can infect Person B, but no longer has symptoms such as fever. In this situation, Person A actually becomes problematic to the un-vaccinated Person B, since it's not obvious to either individual that Person A is infectious.
In the first scenario, your vaccination potentially helps others. In the second, your vaccination potentially hurts others. The mechanism of action can change altruism into unintended harm. This is why the mechanism of vaccination is so important from social perspective.
> effects of the virus at play are irrelevant... only contagion matters
No, I'm sorry, but hospital ICUs near me are 90+% full again and we're returning to a strict lockdown. Given a hypothetical vaccine which reduces symptoms but transmission, the vaccine still reduces the hospitalization rate, so your un-vaccinated person B will have a better chance at treatment. Your situation #2 presumes that people with mild symptoms will be inclined to stay home -- in my experience, this is not the case.
Huh, that's nonsense. Every vaccination also carries risks, so there can be no moral obligation if the risks outweigh the benefits.
That said, I also disagree with the moral obligation. At the very least, there are also other scenarios to consider. For example if only a small group is at risk and can't be vaccinated (too risky), that small group could be isolated or choose to self isolate. Afaik it already happens with chemotherapy patients who are being isolated. There is no obligation for the rest of the world to disinfect everything and walk around in hazmat suits so that chemotherapy patients can walk freely in the outer world.
The effects of the virus at play are irrelevant... long term, short term, sniffles, death. None of that matters to the topic of moral obligation. Only contagion matters, so let's take two opposing mechanistic scenarios:
1 - Reduced infectiousness (what we expect)
Person A getting the vaccine reduces the chance they will spread it to Person B if exposed and/or infected.
2 - Reduced symptoms (counterintuitive)
Person A getting the vaccine still gets infected and can infect Person B, but no longer has symptoms such as fever. In this situation, Person A actually becomes problematic to the un-vaccinated Person B, since it's not obvious to either individual that Person A is infectious.
In the first scenario, your vaccination potentially helps others. In the second, your vaccination potentially hurts others. The mechanism of action can change altruism into unintended harm. This is why the mechanism of vaccination is so important from social perspective.