type 1 poliovirus 脊髓灰质炎i型病毒
On 20 April, four polio cases due to wild poliovirus type 1 were confirmed in Yemen.
4月20日，在也门由1型野生脊髓灰质炎病毒造成的4例脊髓灰质炎病例得到确认。
To date, poliovirus type 1 has been isolated in diagnostic specimens from 7 of these cases.
迄今为止，已在其中7例病例的诊断样本中分离出了1型脊髓灰质炎病毒。
Four cases have been confirmed to have been caused by wild poliovirus type 1 and laboratory testing continues.
经确认，四例病例由1型野生脊灰病毒引起，实验室检测还在继续。
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