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Protection from hospitalization for Omicron variants can drop to 57% from 81% after 6 months from second dose, and can be pushed back up to 90% using booster shots for Pfizer and Moderna vaccines, according to a large CDC study in the US. For Delta variant period last year the vaccine effectiveness against hospitalization was 90% from about two weeks after dose two till 6 months, dropping to 81% after 6 months, and up to 94% after a booster shot. For Omicron variant the currently vaccine effectiveness for same periods is 81%, 57%, and 90%.

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A study shown in New England Journal of Medicine shows Pfizer vaccine 2 doses offers 88% protection from symptomatic disease for delta variant of coronavirus. The Astra Zeneca vaccine has 67% protection against delta variant after 2 doses.

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The problem facing Africa is whether vaccine supplies will run out before new vaccine supplies come from America, Britain and France. Only less than 1% of African people have been fully vaccinated out of a population of 1.3 billion people. US president Biden said America will provide 500 million doses of Pfizer vaccine to poor nations before the G-7 meeting in Cornwall, UK. Britain added 100 million and France 30 million doses. With new more transmissable variants out there Africa is in considerable danger today. The Delta variant from India has been shown to be about 70% more contagious than the Alpha variant from Kent UK. It is already the dominant variant for new cases in the UK. The new variants are now spreading in Africa. Cities such as Johannesburg, South Africa, and Kampala, Uganda are seeing a surge in cases. Another problem in Africa is that governments are increasingly reluctant to impose strong lockdowns because of the economy. Already it is believed that Africa's middle class has been severely affected during the last 18 months. ...

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With more vaccines available from Pfizer and Moderna, and the poor SinoVac Chinese vaccine effectiveness against the Delta variant, Brazil and other countries in Latin America and Asia are shifting away from Chinese vaccines. Brazil's federal government has halted negotiations for additional doses of Chinese vaccines. In the early stages in 2020 Chinese vaccines helped Brazil cope with the devastating rise in cases. The slow pace of vaccinations in US and Europe has freed up more vaccine doses of Pfizer for other countries including Brazil. From accounting for 80% of vaccines in Brazil early in 2020, SinoVac vaccines now make up only 35% of Brazil's vaccine doses. At that time Brazil bought 100 million doses of SinoVac vaccine which were delivered. The local producer of SinoVac vaccine, the Butantan Institute will no longer make Chinese vaccines. While Sinovac vaccines are effective at preventing deaths, the vaccines have a low effectiveness rate for symptomatic infections. ...

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The third or booster dose of vaccine is needed to take out the Omicron variant. The UK Health Security Agency analyzed data from 581 Omicron cases and thousands of Delta cases to calculate how effective vaccines such as Pfizer and Astra Zeneca were against the Omicron variant. This early analysis shows a third booster dose prevents around 75% of people from getting any coronavirus symptoms. The double dose of the vaccine however provides good protection against severe coronavirus that needed hospital treatment says the UK Health Security Agency. Of equal concern is the rate of spread of the Omicron variant. Here this BBC report shows graphs of UK National Health Security Agency which show the rate of spread is rapid with cases doubling every 2-3 days. For the UK which on December 10 had about 1265 cases this means says this BBC report that the number of Omicron cases could be well above 100,000 in the UK by the end of December. The BBC graph shows the curve for Omicron cases moving in a close to vertical direction upwards. Reports say the experience in South Africa where the Omicron variant was first detected is similar in pattern causing rapid spread. ...

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In this interview in The Hindu with Public Health Foundation of India president Srinath Reddy, the importance of safe behaviours including masks and social distancing, public discipline to tackle a potential third wave. This was also pointed out separately by the Director AIIMS.  Mr. Reddy says study by Public Health England shows just one dose of Astra Zeneca vaccine is not very effective against the Delta variant- about 30% effective. As a result he suggests the need to reduce the spacing intervals which are at 8-12 weeks to a shorter interval now that adequate supplies of vaccine will be available starting in July and August till the end of the year. The initial spacing was 4 weeks when Astra Zeneca vaccine was first introduced and at which time the variants had not emerged. The Indian federal government affidavit to the Supreme Court shows that 1880 million doses of vaccine will be available by the end of the year 2021 to vaccinate fully with 2 doses the population of India over 18 years using 5 locally manufactured Made in India vaccines. This does not include the mRNA vaccines that will be made available from Moderna and Pfizer for which cold storage facilities are being prepared by the federal government.   ...

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China faces risk of a surge inthe coronavirus in June 2021. The area in and around Guangzhou appears to be seriously affected. The city tested almost its entire population of 18.7 million between June 6 Sunday and June 8 Tuesday. This report shows pictures of a deserted Beijing airport, strict restrictions on foreign travel. The SinoPharm vaccine effectiveness against the Delta variant in India and UK is unknown. The government is locking down entire neighborhoods rather than entire cities or provinces.  As the risks of the Delta variant and other new variants increases most of the population even in the US and Europe have either no dose or one dose. Researchers at the University of New South Wales in Australia show the Astra Zeneca vaccine effectiveness with one dose at only 30%, only after two weeks following the second dose does the vaccine effectiveness reach about 70%. The population of China and India are so large that much larger parts of the population remain unvaccinated. In China with 1.3 billion people and even if the figure of 800 million doses stated by the government is accepted- it could be an overestimate as the US has only managed 300 million doses with many vaccines- most of the population is unprotected. Vaccine skepticism is high in China making vaccination an uphill task. SinoPharmvaccine is not as effective as Pfizer, Moderna, Astra Zeneca, or Covaxin vaccines, making the task even more of an uphill kind. ...

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In a factory the size of 5 football fields located in Gurnee, Illinois, Abbott Labs makes its BinaxNow Covid-19 home tests. Abbott turned out 1 billion tests in 2021 and at one point had 80% of the market. Along with Pfizer vaccine, BinaxNow Home covid-19 tests are a dominant product during the pandemic. Abbott generated a fifth of its $43 billion in revenue from these home tests. Abbott faced several hurdles along the way. It gained when the US government authorized it to make the test. Yet after vaccination took off by mid 2021 the demand for tests declined and Abbott nearly idled its giant factory in Gurnee. Delta and Omicron variants led to a sudden reversal and surge in demand. Abbott developed its test based on an existing design it used in the US for flu tests, by a company it inherited by acquisition called Binax. To do that test one sends a swab up the nose, add that sample and a liquid mixture to a rectangular paper card, and close the card shut. The liquid then travels up the paper strip, revealing one or two pink lines, one for negative, two for positive. This is done in 15 minutes and the simple design described as a lollipop shape, put Abbott far ahead of competitors. The US FDA authorized Becton Dickinson and Quidel to make the tests before it authorized Abbott, but these rival companies had a poor and complex design. The Trump administration gave Abbott a $760 million contract to buy 150 million tests for distribution to health departments, long termcare facilities, nursing homes, and schools. And by October 2020 Abbott was already making 50 million tests a month. When it comes to distribution Abbott tapped into its pharmacy connections for baby products such as Similac baby formula. This gave it an advantage over Quidel and others who also lacked the manufacturing knowhow for large scale ramp up. The BinaxNow in pharmacies was sold at $24 for a box of two tests, while government paid $5 for one test. Abbott says it makes $ 7 per single consumer test. Yet there was one problem waiting to hit Abbott in 2021- demand dried up as the vaccination campaign took off. In fact the plant manager, Mr. Rodriguez, planned to move to another job inside Abbott as production declined. Then came the Delta variant and he was asked to ramp up production again. With Omicron demand soared. The Biden administration committed $3 billion to help boost test production and asked Kroger and Walmart to sell over the counter tests at cost for 3 months. Abbott had to lure workers from Amazon at $25 an hour for the Gurnee plant expansion. What was learned by the government and Abbott from this experience? The US government now looks for ideas in meeting demand volatility, supply challenges and production needs,. Sustaining production capacity is important for future virus flareups- a new government-industry partnership is required for maintaining test making infrastructure. With government help Abbott plans now to keep the facility at Gurnee operating indefinitely. ...