Immunization Branch

Vaccine Facts: What You Need to Know

Key Takeaways

Vaccines:

Are safe and effective.
Carefully tested.
May cause mild side effects that don't last long.
Act as a tool to help your body fight diseases.

2 adults, one child, one elderly woman smiling with their sleeves rolled up, pointing to a bandaid

Vaccines protect your health and the health of your community. They work by boosting your immune system so you can fight off diseases and prevent yourself from becoming seriously ill.

Vaccines are safe, effective and greatly reduce diseases, disability and death. They're one of the greatest public health inventions and have saved millions of lives around the world over the last 50 years.

Some people may feel unsure about vaccines because of myths or rumors. But the fact is vaccines are an important preventive health measure in keeping you and your family safe. Here are six facts to help clear up common myths.

What You Need to Know About Routine Immunizations

The West Coast Health Alliance (WCHA) and CDPH recommend that parents continue to follow the American Academy of Pediatrics (AAP) immunization schedule for children and teens. Read the full news release.

Recent CDC changes (As of 1/5/2026): A new CDC decision reduces recommended vaccines but did not follow standard safety review and could increase preventable diseases.
Why it matters: Skipping vaccines can lead to more sickness, missed school, and even severe sickness leading to hospitalizations and death in some children.
AAP schedule is evidence-based: It considers when vaccines work best, safety, disease risk in the U.S. and access to care.
Insurance coverage: Vaccines recommended as of December 31, 2025, remain covered by public and private insurance.
Stay informed: Parents should discuss vaccine decisions with their child’s healthcare provider.
Our commitment: CDPH, WCHA and AAP continue to support proven vaccine recommendations to protect children.