New guidelines take a broad definition of who can apply for a religious exemption to vaccinations. A lot will hinge on what constitutes 'undue hardship' to the employer.
Conspiracy theories bloom in times of uncertainty and foster distrust of medical authorities.
Vaccination rates for children in some parts of California are down, despite a law that narrowed exemptions. Here's a look at why people refuse to listen to evidence when it comes to the flu vaccine.