Egg abnormalities question

[my beautiful girls]

I have infectious bronchitis virus in my flock. I had one of the girls blood tested to confirm. They are 6 weeks post infection.

Only 4 out of 6 were affected. My 2 buff orphingtons have no symptoms or egg problems.

All were laying normal eggs prior to the virus.

My black australorp started laying eggs with extra calcium on the shells, then yesterday she was in distress and laid a white banded egg in middle of the run. This morning she laid egg yolk and albumen with no shell in nesting box.

My question is how can you have a banded egg, then just a yolk come out the next day?

Aren't banded eggs two shells touching in the shell gland?

Here are some pictures.

 

[Eggcessive]

My flock had IB virus years ago. I saw most of those egg shell defects afterward for years. In the following article you will see that many defective egg shell problems can be possible with IB effects, stress, and other causes:
https://www.backyardchickens.com/articles/common-egg-quality-problems.65923/

Since chickens with IB virus may be carriers for 5 months to a year, I got rid of it by waiting a year after my hens recovered to either hatch or buy new baby chicks.