A strain of COVID-19 that has infected more than 300 people in Beijing since early June could have originated in South or Southeast Asia, according to a study by Harvard University researchers.
The outbreak in Beijing has raised concerns about China's vulnerability to a "second wave" of infections. The virus found in Beijing cases is an imported strain of COVID-19, according to the China Centre for Disease Control and Prevention.
The Harvard study, published on the preprint website medRxiv.org on Tuesday and which has still to be peer-reviewed, took three of the SARS-CoV-2 genome sequences collected in Beijing last month and compared them to 7,643 samples worldwide.
The three genomes showed the greatest resemblance to cases in Europe from February to May, and to cases in South and Southeast Asia from May to June.
They were also similar to a small number of infections seen in China in March, suggesting the strain could have appeared first in China and then returned to the country three months later, the authors said.
"As the most recent cases in these branches are almost exclusively from South(east) Asia, this could suggest that the new cases in Beijing were re-introduced by transmissions from South(east) Asia," they wrote.
The outbreak traced to Beijing's huge Xinfadi wholesale market on June 11 had infected 329 people by the end of Wednesday.
Quarantine restrictions and large-scale testing of residents began soon after the first cases were identified, and China also required all shipments of imported meat to be tested for COVID-19 before they could leave its ports.
The SARS-CoV-2 virus was believed to have originated in a market in the central Chinese city of Wuhan in December last year and has now infected more than 10 million people and killed more than 500,000 worldwide.
However, some studies suggest it could have been circulating much earlier after crossing the species barrier from horseshoe bats native not only to southwest China, but also Laos and Myanmar.
Reuters
Thu Jul 02 2020
![COVID-19 strain in Beijing outbreak may have come from Southeast Asia: Harvard study COVID-19 strain in Beijing outbreak may have come from Southeast Asia: Harvard study](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/http://img.astroawani.com/2020-07/51593672470_china.jpg)
People wearing face masks are seen at the Sanlitun shopping area, following the outbreak of the coronavirus disease (COVID-19), in Beijing, China July 1, 2020 - REUTERS/Tingshu Wang/File Photo
![Faisal Halim bukti 'pendekar' sejati - Irfan Bakti Faisal Halim bukti 'pendekar' sejati - Irfan Bakti](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2024-08/81723294016_FaisalHalim.jpg)
Faisal Halim bukti 'pendekar' sejati - Irfan Bakti
Faisal Halim layak dilabel pejuang sejati apabila mampu bangkit walaupun berdepan trauma selepas menjadi mangsa simbahan asid pada Mei lalu.
![Polis mohon bantuan kesan Raisya Rasyiqah Polis mohon bantuan kesan Raisya Rasyiqah](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2024-08/61723705839_TBHilang.jpg)
Polis mohon bantuan kesan Raisya Rasyiqah
Polis memohon bantuan orang ramai mengesan seorang remaja perempuan berusia 15 tahun yang dilaporkan hilang di Beranang, Selangor.
![Simbah cat merah, orang suruhan ah long didenda RM3,000 Simbah cat merah, orang suruhan ah long didenda RM3,000](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2024-08/51723705134_TBAhLong.jpg)
Simbah cat merah, orang suruhan ah long didenda RM3,000
Seorang orang suruhan ah long mengaku bersalah atas pertuduhan menyimbah cat merah di rumah keluarga peminjam, Januari lalu.
![Latihan berstruktur sektor ekonomi digital berjaya stabilkan pendapatan, perniagaan asnaf Latihan berstruktur sektor ekonomi digital berjaya stabilkan pendapatan, perniagaan asnaf](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2024-08/51723705177_TBMyREF.jpg)
Latihan berstruktur sektor ekonomi digital berjaya stabilkan pendapatan, perniagaan asnaf
Lebih daripada 30 asnaf bersama ahli keluarga mereka telah diraikan di Majlis Graduasi MyREF Hijrahpreneur Skills Program (MyREF HSP) di Auditorium High Impact Research, Universiti Malaya.
![Polis sahkan pemain bola sepak bawa kerambit sebagai suspek kes baling bom petrol Polis sahkan pemain bola sepak bawa kerambit sebagai suspek kes baling bom petrol](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2024-08/71723704577_RusdiMohdIsa.jpg)
Polis sahkan pemain bola sepak bawa kerambit sebagai suspek kes baling bom petrol
Polis telah mengenal pasti seorang pemain bola sepak yang ditahan kerana membawa kerambit ke padang bola, sebagai suspek kes baling bom petrol di sebuah pusat hiburan di ibu negara.
![Bernama, Perkeso meterai MoU, manfaat 493 pengamal media sambilan Bernama, Perkeso meterai MoU, manfaat 493 pengamal media sambilan](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2024-08/71723703465_TBperkeso.jpg)
Bernama, Perkeso meterai MoU, manfaat 493 pengamal media sambilan
Bernama dan Perkeso menandatangani MoU bagi memperluas perlindungan sosial kepada pengamal media sambilan (stringers) melalui Skim Keselamatan Sosial Pekerjaan Sendiri (SKSPS).
![RADIO 360: Integrasi teknologi kumpul maklumat, data lebih komprehensif RADIO 360: Integrasi teknologi kumpul maklumat, data lebih komprehensif](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2024-08/81723701143_TBastro.jpg)
RADIO 360: Integrasi teknologi kumpul maklumat, data lebih komprehensif
RADIO 360 merentasi 11 stesen radio Astro yang boleh diakses di aplikasi SYOK termasuk Era, Sinar, Gegar, Hitz, Mix, My dan Raaga.
AWANI Ringkas: Pemain bola bawa kerambit juga suspek baling bom petrol
Ikuti rangkuman berita utama yang menjadi tumpuan sepanjang hari di Astro AWANI menerusi AWANI Ringkas.
![Enam mengaku tidak bersalah culik warga China Enam mengaku tidak bersalah culik warga China](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2024-08/81723702959_TBMahkamahSesyen.jpg)
Enam mengaku tidak bersalah culik warga China
Sepasang suami isteri dan empat individu didakwa menculik seorang lelaki warga China untuk mendapatkan wang tebusan berbentuk mata wang kripto.
![Bursa gantung jualan singkat SP Setia Bursa gantung jualan singkat SP Setia](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2024-07/61722341186_BursaMalaysia.jpg)
Bursa gantung jualan singkat SP Setia
Bursa Malaysia menggantung jualan singkat SP Setia Bhd bagi baki tempoh hari ini selepas penyusutan harga yang ketara.
![Kumpulan Palestin tandatangani deklarasi 'tamatkan perpecahan' di Beijing Kumpulan Palestin tandatangani deklarasi 'tamatkan perpecahan' di Beijing](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2024-07/71721730168_HamasWangYi.jpg)
Kumpulan Palestin tandatangani deklarasi 'tamatkan perpecahan' di Beijing
Kumpulan-kumpulan Palestin berikrar untuk menamatkan perpecahan semasa rundingan damai yang berlangsung di Beijing.
![Ahmad Zahid ucap selamat ulang tahun BN ke-50 Ahmad Zahid ucap selamat ulang tahun BN ke-50](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2024-06/71717209864_ZahidHamidi.jpg)
Ahmad Zahid ucap selamat ulang tahun BN ke-50
BN dibentuk oleh Abdul Razak pada 1 Jun 1974 yang merupakan Perdana Menteri serta Presiden UMNO ketika itu.
![Ahmad Zahid mulakan lawatan rasmi ke Beijing Ahmad Zahid mulakan lawatan rasmi ke Beijing](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2024-05/71716963054_ZahidHamidilawata.jpg)
Ahmad Zahid mulakan lawatan rasmi ke Beijing
Timbalan Perdana Menteri, Datuk Seri Ahmad Zahid Hamidi memulakan lawatan rasmi beliau di Beijing pagi ini dengan menghadiri mesyuarat pre-council.
![Ahmad Zahid tiba di Beijing akhiri lawatan rasmi ke China Ahmad Zahid tiba di Beijing akhiri lawatan rasmi ke China](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2024-05/61716894527_AhmadZahidHamidi.jpg)
Ahmad Zahid tiba di Beijing akhiri lawatan rasmi ke China
Timbalan Perdana Menteri, Datuk Seri Ahmad Zahid Hamidi tiba di destinasi terakhir bagi rangka lawatan rasminya ke China, hari ini.
![Perkasa EV: 32 pelajar TVET tempatan jalani latihan di Beijing Perkasa EV: 32 pelajar TVET tempatan jalani latihan di Beijing](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2024-05/71716633020_BeliaMajorChina.jpg)
Perkasa EV: 32 pelajar TVET tempatan jalani latihan di Beijing
Seramai 32 belia berkemahiran Pendidikan dan Latihan Teknikal dan Vokasional (TVET) dihantar ke Beijing, China untuk memperkasa kemahiran dalam Advanced Electric Vehicle (EV).
![Lai Ching-te dari DPP menang Pilihan Raya Taiwan Lai Ching-te dari DPP menang Pilihan Raya Taiwan](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2023-08/61692266870_TBWILLIAMLAICHINGTE.jpg)
Lai Ching-te dari DPP menang Pilihan Raya Taiwan
Lai berdepan saingan tiga penjuru dengan Hou Yu-ih dari Kuomintang (KMT) dan Ko Wen-je dari Parti Rakyat Taiwan.
![Pilihan Raya Taiwan: Rakyat mula jalankan tanggungjawab masing-masing Pilihan Raya Taiwan: Rakyat mula jalankan tanggungjawab masing-masing](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2024-01/41705114688_Taiwan.jpg)
Pilihan Raya Taiwan: Rakyat mula jalankan tanggungjawab masing-masing
Pilihan raya tersebut menyusul ketika Beijing meningkatkan tekanan untuk mendapatkan pulau itu menerima kedaulatannya.
![Beijing alami lebih banyak salji, gelombang sejuk dijangka melanda Beijing alami lebih banyak salji, gelombang sejuk dijangka melanda](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2023-12/51702540373_TBSnowfalljpg.jpg)
Beijing alami lebih banyak salji, gelombang sejuk dijangka melanda
Kawasan perbandaran Beijing mengalami lebih banyak salji pada Khamis dengan gelombang sejuk dijangka melanda ibu negara China itu pada Jumaat.
![33 maut hujan paling lebat landa Beijing 33 maut hujan paling lebat landa Beijing](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2023-08/41691210394_heavyrain.jpg)
33 maut hujan paling lebat landa Beijing
Sekurang-kurangnya lima pekerja bantuan adalah antara mangsa yang maut. 18 orang lagi mangsa masih hilang.
![Berita antarabangsa pilihan sepanjang hari ini Berita antarabangsa pilihan sepanjang hari ini](https://resizer-awani.eco.astro.com.my/tr:w-177,h-100,q-100,f-auto/https://img.astroawani.com/2023-04/41680607592_TBBERITAx.jpg)
Berita antarabangsa pilihan sepanjang hari ini
Antara pelbagai berita luar negara yang disiarkan di Astro AWANI, berikut adalah yang paling menjadi tumpuan sepanjang hari ini.