No further potential source of exposure was identified.
未查明进一步潜在接触源。
This is the first, and, thus far, the only, indication of a possible source of exposure.
这是第一次，也是迄今唯一的一次出现可能接触源的迹象。
Investigation of the July family cluster was unable to determine the source of exposure.
对7月家庭群集的调查未能确定接触源。
Additional food samples are currently being analysed to identify any potential secondary source of exposure.
目前还在对其它食物样本进行分析，以确定是否存在任何潜在的其它接触源。
Tests taken during an investigation to determine the source of exposure have found a duck positive for H5 in the woman's household.
调查期间为确定接触源开展的检测已发现在该名妇女的家中有一只H5型阳性的鸭子。
Braun notes that for people who handle only a couple of receipts a day, thermal paper is unlikely to be a major source of exposure.
布劳恩强调人们一天顶多接触很少几张打印凭据，热敏纸不可能是接触双酚A的主要来源。
The source of exposure is currently under investigation. Her family raises chickens but did not report any mass poultry illness or death.
接触源调查目前正在进行之中，她家养了鸡，但没有任何大规模家禽生病或死亡报告。
The workplace is a common source of exposure to asbestos fibers, as asbestos was widely used in the past for both thermal and acoustic insulation materials.
工作间是一种常见的来源接触到石棉纤维由于石棉被广泛使用在过去两、热隔音材料。
At present, no epidemiological evidence has linked the confirmed case with the suspected case. The possible source of exposure in both cases is under investigation.
根据目前调查，上述确诊病例与疑似病例无流行病学关联。这两例病例的可能传染源正在调查中。
Conclusions Imaging procedures are an important source of exposure to ionizing radiation in the United States and can result in high cumulative effective doses of radiation.
结论：在美国，影像操作是一个重要的电离辐射暴露来源，并可导致较高的辐射累积有效剂量。
Radon in our homes is the main source of exposure to ionizing radiation, and accounts for 50% of the public's exposure to naturally-occurring sources of radiation in many countries.
我们家中的氡是接触致电离辐射的主要来源，在许多国家中占大众接触自然发生的辐射源的50%。
The source of exposure for the initial case is still under investigation, with exposure to infected poultry or an environment contaminated by their faeces considered the most plausible source.
该最初病例的接触源仍在调查之中，接触受感染的家禽或受其粪便污染的环境被认为似乎是最合理的接触源。
What makes these exposures a source of infection is probably not any one exposure but the cumulative nature of being exposed frequently over the course of time.
这些接触是一个感染源，也许这并不是因为任何一次接触，而是长期经常接触的累积性质所致。
Epidemiological investigations uncovered exposure to infected poultry as the likely source of infection in both cases.
流行病学调查揭示接触受感染家禽为这两例的可能感染源。
Investigations into the source of his infection indicate similar environmental exposure as his mother.
对其感染源的调查表明与其母亲相似的环境接触。
Epidemiological investigations so far have not revealed a common source or route of exposure, and these investigations are now being extended in scope.
流行病学方面的调查目前还没有找到共同的接触源或接触途径，目前正在扩大调查范围。
Investigations into the source of infection indicate that the both cases had exposure to sick and dead poultry.
感染源调查显示，两位病人都与怀疑患有禽流感的家禽有过接触。
Investigations have been undertaken to determine the source of the boy's exposure and samples from pigeons around his household are being tested.
已开展调查以便确定该男童的接触源并正在检测从其家庭周围的鸽子中采集的样本。
Investigations into the source of her exposure found reports of bird deaths near her home in the days prior to symptom onset.
对其接触源的调查发现在症状出现前几天在她家附近有禽类死亡的报告。
Investigations of human cases in Asia and elsewhere have identified close contact with diseased or dead household poultry as the most important source of human exposure to the virus.
在亚洲和其它地方对人间病例的调查已确认与家庭禽群或死禽直接接触为人与该病毒最重要的接触源。
Investigations into the source of infection indicate that the three cases had exposure to poultry suspected to have avian influenza.
感染源调查显示，三位病人都与怀疑患有禽流感的家禽有过接触。
Investigations into the source of infection indicate that the two cases had exposure to poultry suspected to have avian influenza.
感染源调查显示，两位病人都与怀疑患有禽流感的家禽有过接触。
Investigations into the source of infection indicate that the case had exposure to poultry suspected to have avian influenza.
感染源调查显示，该病人与怀疑患有禽流感的病禽有过接触。
Investigations into the source of her infection indicate exposure to sick and dead poultry.
对其感染源的调查表明曾接触过病禽和死禽。
Sunlight is the best source of vitamin D, but exposure to sunlight can also raise the risk of skin cancer.
阳光是人体合成维生素D的最好方式，但曝露在阳光下同时也会增加皮肤癌风险。
Investigations into the source of infection indicate that the case had exposure to sick poultry suspected to have avian influenza.
感染源调查显示，该病人与怀疑患有禽流感的病禽有过接触。
Investigations into the source of infection indicate that all the cases had exposure to poultry suspected to have avian influenza.
感染源调查显示，五位病人均与怀疑患有禽流感的禽类有过接触。
Investigations are being undertaken to determine the source of the man's exposure.
正在开展调查以便确定该男子的接触源。
Investigations into the source of his infection indicate a recent history of exposure to sick and dead poultry.
对其感染源进行的调查表明，他最近曾接触过病禽和死禽。
Investigations into the source of his infection indicate a recent history of exposure to sick and dead poultry.
对其感染源进行的调查表明，他最近曾接触过病禽和死禽。
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