Question

An important method for controlling the spread of the h6n2 influenza (bird flu) virus in chickens is having a procedure to determine whether chickens are infected with the virus. it is common to apply a procedure, called an elisa test, to measure the concentration of anti–bird flu antibodies in a blood sample taken from a chicken. if the elisa test reveals a high-enough concentration of antibodies, the chicken is said to test positive, and it is classified as infected with the virus. otherwise, the chicken is said to test negative, and it is classified as not infected. however, the elisa test is a complex procedure that is not always accurate. one type of mistake, a false positive result, occurs when the elisa test gives a positive result for a chicken that is not infected with the virus. a second type of mistake, a false negative result, occurs when the elisa test gives a negative result for an infected chicken.

Answer 1

If we consider the positive possibility of false negative and false positive for tests on individual chicken. Veterinary have developed a procedure to determine if the H6N2 virus is present in the flock of chickens. The veterinary select ten chickens randomly from the flock and perform Elisa test of the blood sample from each and every one of the ten chickens. 
By the conclusion of the veterinary if the H6N2 virus presents in flock if three out of ten chickens have positive Elisa.

Answer 2

Answer:

The probability of false negative and false positive results is present in Elisa. But bird flu is a contagious virus, so relative testing in a known number of chickens in flock is used to get accurate results.

Explanation.

h6n2 influenza is a contagious virus of chickens. It highly spread in the flock via infected individual.

So if we want to test the influenza virus in the chickens. We will take a control, a healthy chicken from not that flock and then compare the Elisa results of flock chicken with test of healthy individual.

If 30 to 40% of results are positive,there means there is influenza virus in flock.