San Francisco may have become the first major American city to hit herd immunity to the coronavirus, experts say.
San Francisco is still recording a small number of coronavirus cases, about 13.7 per day, said Dr George Rutherford, professor of epidemiology at University of California San Francisco, but they don’t appear to be gaining enough of a foothold in the population to trigger wider outbreaks.
“That is what herd immunity looks like,” Rutherford said. “You’re going to have single cases, but they’re not going to propagate out.” Health officials still lack agreement on exactly what percentage of the population must be immune to COVID-19 to achieve the much-vaunted status of “herd immunity,” when so many people have antibodies against the virus that it can no longer spread widely through the community.
Photo: Pixabay 照片：Pixabay
Throughout the pandemic, the vaccination goals to hit herd immunity have been a moving target, a briefing from Yale School of Medicine notes, with experts initially estimating that the virus would have difficulty spreading if 60 to 70 percent of the population was immune. With several variants in circulation, some of which are more contagious, the estimates have been climbing. Many experts now estimate that herd immunity will be achieved when 80 to 90 percent of residents have been vaccinated.
San Francisco has been close to that target. Nearly 80 percent of San Francisco residents eligible to receive the coronavirus vaccine have received at least one shot, according to data from the city’s health department, and 68 percent are fully vaccinated.
A n invasion of Southeast Asian dwarf honey bees, suspected to have entered the country via cargo or passenger ship, and initially detected not far from Kaohsiung Harbor, is causing problems in the city. Since the bees prefer to build their hives on branches, poles or other long cylindrical objects found on balconies, their presence often causes a big shock to residents. In the first half of this year alone, Kaohsiung public health officials have removed more than 500 beehives — a clear indication that the bee population is gradually expanding through the city. In an effort to deal with
A: We still haven’t decided what to do with all these free mangoes. I keep coming up with ideas, and you just shoot them all down. B: I think the fairest thing to do is just divide the boxes between the staff. A: There are 25 boxes and only 20 people working here today. What do we do with the other five boxes? B: Go home and get your blender and the milk and ice. I could do with a smoothie after all this back and forth. A: 我們還沒決定到底要怎麼處理這些免費的芒果。我不停想到一些做法，可是都一直被你打槍。 B: 我覺得最公平的做法，就是把這幾箱平均分配給同事。 A: 這裡有二十五箱，可是今天只有二十個人來上班。那剩下的五箱要怎麼辦？ B: 回去把你的果汁機、牛奶和冰帶來啦！我們討論那麼久，我真的需要喝點冰沙了。 (Paul Cooper, Taipei Times／台北時報林俐凱譯)
What are we going to do with them all? (4/5) 這麼多芒果要怎麼辦？（四） A: OK, I have one more idea about the free mangoes. Just hear me out. I have a blender at home. I’ll be back in a while with some milk and ice, and we’ll make smoothies for the office. We could charge NT$25 a pop, just to cover my costs and labor. B: Instead of thinking about schemes to make money from the management’s generosity, why don’t you do some actual work? Also, do you have any idea how many smoothies 25 boxes of mangoes will make? A: You can’t have too many mango smoothies. It’s the elixir of the gods. People