DDelta waves have increasingly left governments around the world up in the air, but the spread pattern of the Sars-CoV-2 variant originally discovered in India is different everywhere. World Health Organization (WHO) The infection rate is reported to have broken out again, and the number of cases has risen again recently, with nearly 4.4 million Covid-19 victims. According to the World Health Organization, more than 90% of the samples sequenced in the past 4 weeks are delta variants. However, not all countries can provide enough data to unquestionably attribute the third global pandemic wave to highly contagious delta mutations.
At least the statistics are this: According to them, the vast majority of the increase in infections, diseases and deaths comes from North America, with an increase of more than 90%, especially from the United States, especially those extremes from Florida to Louisiana and Germany. In Texas, the low vaccination rate and loose corona rules in the south wait for the state to experience the highest growth after the fall wave last year. Also in Asia, Africa, and Australia—although the incidence rate is lower than in the United States—and in parts of Europe, according to genome analysis, it can be said that Delta is exploiting its threatening infectious potential, which has been proven in laboratory research and Epidemiological investigations in the months following the Indian wave have become identifiable.
Since then, the warning has always sounded similar: because Delta is at least twice as infectious as the original virus due to its mutation, it reproduces faster in the mucosa of the upper respiratory tract and may remain infectious for longer. Full vaccination has The highest infectivity. priority.
Does the vaccine no longer work?
But the question mark is increasing-this is due to the latest developments in morbidity and morbidity. Ironically, during the worst delta wave in spring, India’s daily infections exceeded 400,000, but it has remained stable for several weeks. Only 6% of the billion people are still fully vaccinated. However, as the government recommended antibody samples in June and July, two-thirds of the population may have been exposed to at least temporary immune protection. In February, antibodies were detected in only one in five Indians. This can at least theoretically explain the calm epidemic experienced by only one in ten new infections in the subcontinent.
In fact, some experts wanted to explain the sharp drop in the violent delta waves observed in parts of the UK at the end of July-although it eased in the summer. In some areas, up to 90% of antibody immunity has been found on the island. So herd immunity already? Most experts are skeptical, because immunity and the spread of the virus on the island are very different. The same applies to India: in many densely populated metropolises, the delta is clearly still expanding.
In some Asian countries, SARS-CoV-2 has been under control for a long time, and the incremental increase is not unexpected—the same is true in Australia. For a long time, vaccination progress has been slow, and the proportion of people who have not been vaccinated is relatively high, especially the young and middle-aged population. But what, so experts wanted to know for the first time in mid-July, and then what happened in Israel, which is a demonstration country for vaccination with more than two-thirds of vaccination coverage — and also what happened in Iceland and Malta, where The vaccination rate is 90% better-are there even many people who get vaccinated now that get sick? Does the vaccine no longer work?
The immunity of the elderly will weaken after a few months
So far, the approved vaccines are still very effective in protecting against serious diseases and deaths, even for Delta Air Lines. However, in terms of infection, the vaccine is not perfect. Recent data in the United States shows that unvaccinated young people, including children, are more susceptible to the disease. Most importantly, however, it affects many fully vaccinated people in Israel. Two thirds of the last 400 critically ill patients in Israeli clinics were vaccinated and one third were not vaccinated. This is no accident for immunologists. As of the end of January, Israel had vaccinated nearly 2 million people, most of whom were elderly people over 65 and the elderly. However, among these people, especially those over 80, it is now clear from the data of German scientists that the immunity may be significantly weakened after a few months. As we age, antibodies in the blood are broken down, and useful T immune cells decrease.
The new data on Israeli booster vaccination of high-risk populations supports the argument for loss of immunity, but it is still provisional data: among the more than 600,000 citizens who received the third dose of vaccine since the end of July, the delta wave measurement has clearly broken the number of cases. -Unlike other populations. In fact, the proportion of people under 60 and over 60 who are seriously ill is as expected by the Vaccination Institute: it is clear that a small number of people who are vaccinated are sick.
According to Israeli new crown virus expert Dvir Aran (Dvir Aran), the effectiveness of the vaccine against Delta has reached nearly 90% in the younger age group. But in at least some of these countries, vaccination protection has been reduced to the point where the risk of infection has increased slightly. However, the rumor that emerged in the first delta analysis that people who are vaccinated can also infect others, but it has not been clarified in previous studies.
