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袁國勇:4歲男童1月感染機會較大 感覺上已「清零」

21 5 月, 2021
in 國民
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袁國勇認為,男童在一月時感染再復陽機會較大,雖然未有確實結論,但他相信本港疫情「感覺上已清零」。(施華駿攝)

本港最近一宗源頭不明新型肺炎本地個案,為上周六確診的4歲男童,入院後病毒及抗體測試也是陰性。昨日指個案屬「真陽性」的港大微生物學系講座教授袁國勇繼續調查事件,到男童曾求診的診所採集環境樣本,並了解男童領取的深喉唾液樣本,會否受疫苗殘餘病毒基因污染。袁國勇說,男童居住的白田邨,一月曾有家庭感染,男童與確診家庭使用同一部升降機,仍然認為男童在一月時感染再復陽機會較大,雖然未有確實結論,但他相信本港疫情「感覺上已清零」。

有關診所為青衣的西醫楊超發診所,有提供接種科興疫苗的服務。袁國勇表示,有可能診所打開樣本包時,疫苗殘餘病毒基因污染樣本包,雖然殘餘病毒基因不會感染他人,但若進入人體,病毒檢測依然會呈陽性,不排除男童因此檢測呈陽性,但抗體測試呈陰性。袁國勇亦引述內地有文獻指,接種科興疫苗時曾經出現環境污染,令已死病毒進入人體,以致檢測時呈陽性。

袁國勇表示,要證明推論屬實,就要作完整病毒基因排序,若發現基因排序與武漢原始病毒基因相似,就可說明疫苗的殘餘病毒基因進入男童體內,若基因排序類似近期本港流行的病毒,則屬近期感染,但目前並無辦法作完整基因排序。至於男童出現的病徵,袁國勇指,化驗男童的血清後,發現男童可能感染「玫瑰疹」,並出現發燒及喉嚨痛等症狀。

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