Infection through casual contact is thought to be exceedingly rare.

通过偶然接触的感染被认为极其罕见。

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Infection may also spread through contact with the soiled clothing or bed linens from a patient with Ebola.

接触埃博拉患者用过的衣服或床单也可导致感染的蔓延。

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Health care workers themselves run a risk of HIV infection through contact with infected blood.

与感染了HIV病毒的血液有接触的医护人员也面临着感染的风险。

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Other impacts associated with inadequate sanitation include an estimated 260 million people infected with schistosomiasis, a potentially fatal parasitic infection spread through contact with contaminated water.

FORBES: Connect

"Scientists do not know to what extent flu viruses spread through the air or whether infection requires physical contact with contaminated fluids or surfaces, " a summary of the report says.

CNN: Report on handling H1N1 cases: Use masks with airtight seals

The virus can be transmitted through the air from respiratory infection or by close contact between horses.

BBC: Heythrop Hunt suspended over equine herpes