近期，部分地方新增感染者处于快速增长期，各地想方设法保健康、防重症。
目前国内是否仍有德尔塔变异株流行？网传的白肺和原始毒株有关？出现白肺的感染者多吗？针对公众关心的一些热点问题，国务院联防联控机制组织专家作出解答。
The more virulent Delta strain of COVID-19 is not currently circulating in China according to epidemiological data, experts said.
Xu Wenbo, the director of the National Institute for Viral Disease Control and Prevention of the Chinese Center for Disease Control and Prevention, said real-time epidemiological data show no trace of the Delta strain in the country, nor of a recombinant of the Delta and Omicron strains.
Since early December, scientists have detected nine strains, all of which are variants of Omicron, he told Xinhua News Agency.
▌白肺与原始毒株和疫苗接种没有关系
从近期的公众反映情况看，有的新冠病毒感染者在就诊过程中发现了肺炎或者是CT出现了白肺的现象，有网友认为，出现这种情况可能是跟感染了原始毒株或者接种疫苗有关系的。
X-ray images of the whited-out lungs of recently infected patients have been circulating on Chinese social media lately, prompting speculation that more severe strains of COVID-19 are spreading in the country.
Jiao Yahui, director of the National Health Commission's Bureau of Medical Administration, said that whited-out lungs is a sign of severe pneumonia that could result in breathing difficulties and low blood oxygen levels.
However, this is not a symptom of the original COVID-19 viral strain or of vaccinations, she said, adding the current variants in circulation are from the Omicron family.
Xu said that the BA.5.2 and BF.7 strains are the dominant variants in China, accounting for over 80 percent of cases. However, 31 Omicron strains are present on the Chinese mainland, including the BQ.1 and XBB variants that are driving up cases in other countries.
Wang Guiqiang, director of the Department of Infectious Diseases at the Peking University First Hospital, said that for most people who are not immune compromised, the chance of reinfection by the same strain of virus is extremely low.
He added that even if reinfection were to occur, symptoms would most likely be mild, but if a new strain of virus with greater ability to evade immunity were to emerge, then there is a chance of reinfection, Wang said.
"Therefore, people should still protect themselves after this wave is over," he said.
Elderly people, especially those who did not take vaccinations, should take oral antiviral small-molecule drugs as soon as possible if they are infected, normally within five days, according to Wang.
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