Dennis 37 wrote:It is simple. I give credit to politicians who trust the information given to them by health experts and use that information to inform their decisions. Invariably the rate of infection will be lower than in jurisdictions where politicians care more about the economy than people dying.
The Republican governor of Massachusetts has done a good job. He listened to and followed the advice of health experts, not unlike Rob Ford. New cases each day are low compared to the rest of the US, 162 today, and he just announce that anyone, without reason, may apply to receive a ballot in the mail for the upcoming primaries and the November election. He is a Republican who cares about people, a rare combination.
I don't generally think it's fair to judge governors by their case counts, but since you are doing so, I have to point out that Massachusetts is a terrible example of a successful state in that regard. It got a lot less attention than NYC, but the result was nearly as bad in Boston. 1.6% of the entire state has had confirmed positive tests. Given the usual estimate that 10x as many people have had the virus than confirmed by positive tests, that puts about 16% of the entire state having been exposed to the virus. Antibody tests in particular hard hit parts of the state showed a third of residents having been exposed. So yes now they are doing better, but that's just because they already went through their horrible period. I actually think Massachusetts makes a point I made in another thread even better than I did there using NYC as an example, that places that have been especially hard hit provide pretty good evidence that having a percentage of people like 10%-20% exposed already slows infections more than simple models would suggest. New daily cases continued increasing in Massachusetts for a month after full lockdown measures were implemented. If anything, over this time, lockdown effectiveness slightly decreased as people experienced lockdown fatigue, so the explanation for why new cases eventually turned the corner when they did so cannot be the lockdown. Instead, just like the other places that were extremely hard hit like NYC, Milan, and Montreal, the progression slowed down eventually once enough people had already gotten it.
The high herd immunity thresholds commonly cited are based on a simple idea that if people on average infect 3 others when there is a fully susceptible population, then you would need 2/3 of the population to no longer be susceptible in order for the rate of transmission to drop below 1 on account of herd immunity. This is where the 60%-70% threshold numbers commonly cited come from. But, it's actually quite unrealistic, as we know that there is great variation in how many people each infected person infects, with most people infecting no one, and a relatively small number being superspreaders responsible for the majority of infections. Indeed, researchers estimate that 10-20% of people cause 80% of the infections (
https://www.scientificamerican.com/article/how-superspreading-events-drive-most-covid-19-spread1/). This turns out to matter a lot, since the people who interact the most with others are both more likely to get the disease (and therefore get it and become immune earlier on average) and more likely to spread it to more people. Here's a paper by epidemiologists explaining why this variation in how much different people interact with others lowers the herd immunity threshold substantially below the commonly cited numbers
https://www.medrxiv.org/content/10.1101/2020.04.27.20081893v1.full.pdfI don't think we should be praising places like New York or Massachusetts specifically for their current case numbers because those are aided in large part by the fact that they already had their waves. The West Coast (California, Oregon, Washington) wasn't hit as hard the first time, and those leaders are at least as cautious as the Northeast leaders are currently with regards to their reopenings (most things are actually open again in Massachusetts). The difference is that a small percentage of residents in the west coast have yet been exposed as compared to the Northeastern states, not the superior policies of the Northeast governors relative to the west coast governors.