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2022年6月13日 · 台中市衛生局副局長陳麗娟則說明,依國際研究,BA.4、BA.5傳染力較高,且有免疫逃脫的特性,可能造成較多突破性感染及重復感染,多數患者屬無症狀者,就算有症狀也是很輕微,例如發燒、咳嗽等。 確診康復後,還會染上BA.4、BA.5嗎? 由於冠狀病毒的免疫力並非永久,即便之前感染過其他變種病毒,仍可能被BA.4和BA.5再度感染。...
2022年9月4日 · Omicron BA.4、BA.5來襲!自新冠疫情爆發以來,全球相繼出現Alpha、Beta、Gamma、Delta和Omicron新冠變異病毒株。到底變種病毒Omicron亞型變種株BA.4、BA.5患者會出現甚麼病徵?與BA.2 有何不同?一文了解症狀、潛伏期、疫苗效用等資訊。
2022年4月20日 · 至於BA.4和BA.5,目前主要在南非地區發現。 兩者與BA.2有多個相同之處,且同樣缺乏S基因可導致偵察困難。 現時無跡象日顯示病毒比BA.2有更強的傳染性或致病能力。 圖為3月19日,美國伊利諾伊州一間疫苗中心的莫德納新冠疫苗。 接種疫苗仍然是目前預防或減輕感染時症狀和病情的最好方法。 (AP) 變種混合重組而成的X系統. 至於XE、XM等的變種,是由新冠病毒不同變種混合重組而成的變種。 患者有機會出現多個變種同時感染,而病毒有機會在感染細胞的同時進行基因交換,重組成為新病毒。 例如早前的Delta-Omicron混合的「Deltacon」是其中一例,但Deltacon不是標準叫法,正確應根據混合形式稱作XD、XF或XS。
2022年8月17日 · 《新英格蘭醫學雜誌》發表研究報告稱,BA.4和BA.5可以「基本逃脫」疫苗接種或曾經感染的免疫保護,即它們逃避免疫阻遏的能力很強。 《科學》雜誌上的一項研究還表明,初始的奧密克戎變異株就像一種「隱形病毒」,使人的免疫系統對後來的亞型變異株降低警惕性,辨識力降低。 這是科學家所稱的「免疫印記」作用。...
- What Are Ba.4 and Ba.5?
- Why Are The Variants on The Rise Globally?
- What Impact Will Ba.4 and Ba.5 Have on Society?
- How Well Do Vaccines Work Against The Variants?
- What Will Come Next?
The two variants are more similar to BA.2 than to the BA.1 strain that kicked off most countries’ Omicron waves late last year. But BA.4 and BA.5 carry their own unique mutations, including changes called L452R and F486V in the viral spike protein that might tweak its ability to latch onto host cells and skirt some immune responses. A May preprint1...
Variants’ transmission advantages can result from biological changes that speed infection, for instance, allowing the virus to infect more people, more quickly. But the rise of BA.4 and BA.5 seems to stem, instead, from their capacity to infect people who were immune to earlier forms of Omicron and other variants, says Christian Althaus, a computat...
This, too, is likely to vary by country. Despite high case numbers, South Africa experienced only a small rise in hospitalizations and deaths during its BA.4 and BA.5 wave, says Waasila Jassat, a public-health specialist at the country’s National Institute for Communicable Diseases in Johannesburg. In a study that will soon be posted to the medRxiv...
Lab studies consistently suggest that antibodies triggered by vaccination are less effective at blocking BA.4 and BA.5 than they are at blocking earlier Omicron strains, including BA.1 and BA.22–6. This could leave even vaccinated and boosted people vulnerable to multiple Omicron infections, scientists say. Even people with hybrid immunity, stemmin...
That’s anybody’s guess. The parade of Omicron subvariants could continue, with new variants picking further holes in existing immunity. “Nobody can say BA.4/5 is the final variant. It is highly probable that additional Omicron variants will emerge,” says Kei Sato, a virologist at the University of Tokyo. Researchers have identified several spots on...
- Ewen Callaway
2022年6月23日 · BA.4、BA.5看似傳播力異軍突起,但其實主要是借助免疫逃避的效果,亦即先前出的病毒株(如BA.1、BA.2)所產生的保護力不足以對後出現的病毒株(BA.4、BA.5)產生效果。 不過,這些差異可被接種3劑疫苗彌補。 Q2:BA.4和BA.5的症狀更不舒服、更嚴重? 胸腔暨重症專科醫師黃軒於社群引述法國、日本、英國研究指出,BA.4、BA.5的症狀會更不舒服、更加嚴重。 相較BA.1、BA.2於先前的Omicron病毒,BA.4、BA.5的臨床症狀都更明顯,常見的三大症狀包括:疲倦無力、咳嗽、發燒。 此外,BA.4、BA.5患者的呼吸困難增加3倍,噁心、嘔吐增加2.5倍。 而英國隨著BA.4、BA.5的流行,醫院住院率與佔床率也紛紛增加。
2022年6月13日 · 疫情指揮中心13日引述研究說明,BA.4和BA.5亞型變異株均具有傳染力較高,以及免疫逃脫的特性,具有社區傳播能力。 醫療應變組副組長羅一鈞解釋,BA.4、BA.5 的傳染力約較BA.1、BA.2高出2至3成,又BA.5在英美占比目前略高於BA.4,傳播力略勝一籌,但未若Omicron取代Delta變異株時,是以倍數增加。 根據紐約時報 報導 ,美國疾管署以模型預估,BA.4和BA.5的病例數,將超越主流的BA.2及BA.2.12.1,在阿肯色州、路易斯安那州、新墨西哥州等地,BA.4和BA.5的感染人數已超過2成,但尚無更多證據可證明BA.4和BA.5更容易導致重症。