herd infection造句

"herd infection"是什麽意思   


  1. It has successfully reduced cattle and deer herd infection rates from more than 1700 in 1994 to fewer than 100 herds in July 2011.
  2. Derek Belton, Ministry of Agriculture's animal biosecurity director, played down any longterm impact a herd infection could have on the country's industry, noting that many countries have found brucella suis infection in their pig herds.
  3. Although vaccinating cattle is a recognised method of avoiding killing wildlife but reducing the prevalence, incidence and spread of bTB in the cattle population and could also reduce the severity of a herd infection regardless of whether infection is introduced by wildlife or cattle it has three problems.
  4. It's difficult to find herd infection in a sentence. 用herd infection造句挺難的


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