Lofgren’s disease has been observed frequently in commercially raised cattle but very rarely in chickens. Both cattle and chickens raised for meat are often fed the type of feed that transmits the virus that causes the disease. Animals infected with the virus take more than a year to develop symptoms of Lofgren’s disease, however, and chickens ommercially raised for meat, unlike cattle, are generally brought to market during their first year of life.
Which of the following is most strongly supported by the information provided?
A. The virus that causes Lofgren’s disease cannot be transmitted to human beings by chickens.
B. There is no way to determine whether a chicken is infected with the Lofgren’s disease virus before the chicken shows symptoms of the disease.
C. A failure to observe Lofgren’s disease in commercial chicken populations is not good evidence that chickens are immune to the virus that causes this disease.
D. An animal that has been infected with the virus that causes Lofgren’s disease but that has not developed symptoms cannot transmit the disease to an uninfected animal of the same species.
E. The feed that chickens and cattle are fed is probably not the only source of the virus that causes Lofgren’s disease.
I picked B too, and I still don't understand OA's reasoning. The first sentence states that the virus is found, but only rarely. In statement C, it says that the "it is not good evidence that chickens are immune to the virus". Immunity to the virus is not a question here since some chickens have already been spotted.
The point of the passage is "Lofgren’s disease has been observed frequently in commercially raised cattle but very rarely in chickens"
and the reason why its spotted rarely is because SYMPTOMS are the only way someone can tell if chickens have the virus - meaning there is no other way of finding out if the chicken has a virus other than purely going by symptoms - answer B.
Someone please help! Thanks!
I also have the same line of thoughts as yours.....only reason i can come up with to negate B is it's an extreme choice ONLY, which should be avoided on GMAT-CRs as