The path of COVID-19 reminds me of a rollercoaster, now on wave #8, I think. The current phase is 4 times lower in deaths/day than the peak that came in February of this year, and almost 6 times below the high that occurred in January of 2021. In new cases/day, the highest number of new cases/day occurred on January of this year at around 4 million/day, with the highest in this current phase 3 times lower at around 1.35 million/day.
From all reports, the COVID-19 Omicron subvariant BA.5 could be the most infectious virus known to man. Measles? Maybe now in second place.
- The original Wuhan strain had a reproductive rate (known as Ro or R-naught value) of 3.3, meaning that each infected person would infect 3.3 others.
- The 1918 Spanish Flu, for example, was only 2.0.
- Mumps =12 and measles = 18.
- The Delta variant? 5.1.
- The first Omicron, BA.1 = 9.5.
- Then came the stealth Omicron = 13.3.
- Now, both BA.4 and BA.5 = 18.6.
Now comes Centaurus, BA.2.75. Reproductive rate? Still unknown, but suspected to be higher than BA.5.
A month ago BA.2.75 began surging through India. The fear was this strain would be able to spread more rapidly and get around existing immunities and vaccinations.
But on July 19 the Business Standard of India reported: Covid: Omicron sub-variant BA.2.75 not as dangerous as "hyped." On July 22 Becker's Hospital Review corroborated, with BA.2.75 a "Scarient," not the next variant to worry about. Whew.
Then, on August 10 Medical Life Sciences News said that BA.2.75 shows signs of being more contagious than BA.5. In addition this strain is more immune resistance than other variants.
On the same day, Nature again asked the question: Will Centaurus be the next global coronavirus variant?
- Cases rising in India, but the hospitalization rates are low.
- 20 countries now have this BA2.75 subvariant.
- BA.5 and BA.2.75 have similar capacities to dodge immunity conferred by infection and vaccination.
- But BA.2.75 seems to be more contagious.
- There was a sense that this subvariant might well be contained in India.
Both Moderna and Pfizer announced a new booster to be made available in September, specifically to protect us from BA.4 and BA.5. But will this vaccine also prevent or protect us from BA.2.75? Not yet known, but if you look at the evolution of these subvariants, you would think at least maybe because they all spawned from BA.2.
Regarding this second booster, I'll be early in line for the 105 million doses of Pfizer and 66 million of Moderna already ordered. Any more will require additional funding from Congress.
Here is an update on who is eligible for what. A big problem is that any vaccine loses effectiveness after the last shot in five months, or less. Earlier this month, only about a third of Americans had received their first booster shot. 65% are eligible. Worse, 21% had not received any vaccine dose, and and only 34% of 61 million eligible have taken their second shot (the one before the first booster). In other words, 75% of Americans are considered NOT UP TO DATE. I continue to be mystified as to why.
Need to end with something nicer.
-
Comments
Post a Comment