Yes, the disease in the chicken can pass into the eggs. The disease can be passed through the reproductive system of the chicken or through the eggshell. Diseases such as infectious bronchitis and avian influenza can be passed through the oviduct of the chicken, while salmonella and E. coli can be passed through the eggshell.
Infectious bronchitis, which is caused by a coronavirus, can be transferred to the egg during the laying process. The virus can be carried to the oviduct, where it can be deposited into the egg. Avian influenza, or bird flu, can also be passed to the egg in the same way.
Salmonella and E. coli can be passed through the eggshell when the chicken is infected. These bacteria can contaminate the eggshell if the chicken is carrying the bacteria in its reproductive organs. Eggs can also be contaminated with bacteria found on the outside of the eggshell if the chicken is carrying the bacteria in its digestive tract.
In order to prevent the spread of disease through eggs, it is important to practice good biosecurity. This includes properly cleaning and disinfecting the egg collection, storage, and handling equipment. Additionally, all eggs should be inspected for signs of contamination prior to sale.