Guide · Healthcare Workers

Healthcare worker vaccine requirements.

Reviewed August 2026 · Based on ACIP Immunization of Health-Care Personnel (MMWR RR-7) and the CDC/ACIP adult immunization schedule. Educational reference, not medical advice.

Hospitals, nursing schools, and staffing firms don't invent their vaccine checklists. Nearly every requirement comes from the same document — the CDC/ACIP recommendation Immunization of Health-Care Personnel, published in MMWR¹ — layered with OSHA's Bloodborne Pathogens Standard² for Hepatitis B. Once you understand what those two documents say, the alphabet soup of forms, portals, and staffing-agency checklists starts to make sense.

Why healthcare workers get asked for titers, not just records

Vaccination records — even authentic ones — establish that a dose was administered. They don't prove your immune system responded. For six vaccine-preventable diseases where a healthcare worker's exposure risk (and patient-transmission risk) is high, ACIP allows either a documented dose schedule or serologic evidence of immunity. Most hospitals and clinical programs standardize on the latter — the titer — because it removes ambiguity. If your titer is positive, you're immune; if it's negative or equivocal, you get revaccinated. No arguing about whether a 30-year-old paper card is genuine.

The standard six-item checklist

MMR — 2 documented doses, or a positive quantitative titer

The MMWR guidance for healthcare personnel is explicit: measles, mumps, and rubella immunity requires either two doses of MMR vaccine at least 28 days apart (first dose on or after the first birthday) or "measles / mumps / rubella immunoglobulin (IgG) in the serum; equivocal results should be considered negative"¹. Note the last four words. A borderline titer counts as negative for HCP purposes, which triggers revaccination.

Birth-before-1957 is not a free pass for healthcare personnel. The MMWR states that facilities "should consider vaccinating personnel [born before 1957] with 2 doses of MMR vaccine at the appropriate interval" if they lack laboratory evidence of immunity, and should recommend it during outbreaks¹.

Varicella — 2 doses, a positive titer, or physician-verified disease history

MMWR RR-7 accepts several forms of varicella immunity for HCP. A verified history of typical chickenpox counts, but with a specific requirement: "Verification of history or diagnosis of typical disease can be provided by any health-care provider (e.g., a school or occupational clinic nurse, nurse practitioner, physician assistant, or physician)"¹. For atypical or mild cases, the MMWR adds that "assessment by a physician or their designee is recommended," and warns that "when such documentation is lacking, persons should not be considered as having a valid history of disease"¹. Translation: "I had chickenpox as a kid" needs to be signed off by a clinician, or you need a titer. There's also a well-known caveat — commercial assays "often lack sensitivity to detect vaccine-induced immunity (i.e., they might yield false-negative results)"¹ — which is why a negative titer after documented vaccination sometimes just triggers a booster rather than a full re-series.

Hepatitis B — full vaccine series plus a post-vaccination anti-HBs titer

This is where healthcare workers differ most sharply from the general public. OSHA's Bloodborne Pathogens Standard² requires employers to make Hep B vaccination available to any employee with reasonably anticipated exposure to blood or other potentially infectious materials. ACIP requires a post-vaccination anti-HBs titer of ≥10 mIU/mL drawn 1–2 months after the final dose to confirm the vaccine took. If the titer is below 10, you get a repeat series and are tested again.

Every clinical program (nursing, medical, dental, PA, EMS, phlebotomy) requires this titer — not just the vaccination records. It's one of the most common titers ordered.

Tdap — 1 dose, then Td/Tdap booster every 10 years

Standard ACIP adult recommendation. All HCP should have received at least one dose of Tdap, then a Td or Tdap booster every 10 years thereafter³. No titer is used for tetanus, diphtheria, or pertussis. Documentation is straightforward — the dose is either in your records or it isn't. If it isn't, get a Tdap.

Influenza — annually, without exception in most facilities

Annual seasonal flu vaccination is on the ACIP schedule for everyone 6 months and older³. Virtually all U.S. hospitals require it as a condition of employment, and most require documented proof of the current-season shot by a stated deadline (usually October 31 or November 30). No titer is used. The vaccine has to be re-administered every season; last year's dose doesn't count.

COVID-19 — depends on the employer

ACIP recommends the current-season COVID-19 vaccine for adults 19 and older, with adults 65+ specifically due for two or more doses³. Whether your employer requires documentation varies. Some large hospital systems still mandate current-season vaccination; some don't. Check the specific policy in your onboarding packet.

The optional add-ons some facilities require

• Tuberculosis screening. Not a vaccine, but universally required. Most facilities accept either a two-step PPD skin test, a QuantiFERON-Gold or T-Spot IGRA, or a chest X-ray if you've had a prior positive result. Annual repeat screening is common in high-risk settings. Important timing note: if you also need MMR or varicella, see the callout below — live vaccines can suppress TB test results.
• Polio (IPV). Historically not required for HCP with documented childhood series. Some pediatric-facing programs are adding it.
• Hepatitis A. Not universally required, but common for staff in food-service-adjacent roles (dietary, environmental services).
• Meningococcal (MenACWY / MenB). Only required for microbiologists routinely working with Neisseria meningitidis isolates.

The single most common reason a healthcare worker's onboarding gets held up is the Hepatitis B post-vaccination titer. If you know you completed the series but can't find the anti-HBs result, order that titer before your start date.

How the paperwork typically flows

Most hospital systems use a third-party occupational-health portal (VerifyEmployment, CastleBranch, PreCheck, HireRight) that pulls together three streams of evidence:

1. Documentation of doses — your childhood or prior-employer immunization record.
2. Serologic proof of immunity — quantitative titers for MMR, varicella, and hepatitis B.
3. An occupational-medicine physical — including TB screening, and often a fit-test for N95 respirators.

The occupational-health team at your new employer is a good ally. If a titer comes back negative or equivocal, they typically administer the booster or repeat series on-site.

If your records are missing

For MMR, varicella, hepatitis A, and hepatitis B, titers replace records entirely — a positive titer is stronger evidence of immunity than a paper card. For Tdap and flu, the fastest path is usually a new dose (they're both due periodically anyway). For polio (IPV), an adult booster after childhood series is almost never needed.

Start with your state's Immunization Information System — see the state records directory. If nothing surfaces, titers are usually your fastest option.

Sources

1. CDC — Immunization of Health-Care Personnel: Recommendations of ACIP (MMWR RR-7). Verbatim source for the MMR IgG "equivocal results should be considered negative" rule and the varicella verified-history language.
2. OSHA — Bloodborne Pathogens Standards. Establishes the employer's obligation to offer Hepatitis B vaccination.
3. CDC — Adult Immunization Schedule by Age. Tdap, flu, and COVID-19 recommendations.
4. CDC Epidemiology and Prevention of Vaccine-Preventable Diseases (Pink Book), Appendix A. Source for the ≥ 4-week TB-test-after-MMR guidance.