I thought I'd read that it is best to continue feeding when ill.
Here is what the womenshealth.gov says
"Can I breastfeed if I am sick?
Some women think that when they are sick, they should not breastfeed. But, most common illnesses, such as colds, flu, or diarrhea, can't be passed through breast milk. In fact, if you are sick, your breast milk will have antibodies in it. These antibodies will help protect your baby from getting the same sickness.
Breastfeeding is not advised if the mother:
Has been infected with HIV or has AIDS. If you have HIV and want to give your baby breast milk, you can contact a human milk bank.
Is taking antiretroviral medications.
Has untreated, active tuberculosis.
Is infected with human T-cell lymphotropic virus type I or type II.
Is taking prescribed cancer chemotherapy agents, such as antimetabolites, that interfere with DNA replication and cell division.
Is undergoing radiation therapies; but, such nuclear medicine therapies require only a temporary break from breastfeeding." x