13.4 Adult Immunization & Environmental and Occupational Exposure Screening
Key Takeaways
- Fetal radiation doses below 50 mGy have not been associated with anomalies or loss, and the occupational limit for a declared pregnant worker is 5 mSv across the whole gestation.
- The CDC blood lead reference value is 3.5 mcg/dL, and pregnancy mobilizes lead stored in maternal bone.
- The Pregnant Workers Fairness Act requires covered employers to provide reasonable accommodations for pregnancy-related limitations.
- Employers must supply Safety Data Sheets for workplace chemicals, and MotherToBaby and the regional PEHSU provide exposure-specific counseling.
- Prolonged standing beyond about 4 hours, repeated heavy lifting, and rotating night shifts carry modest associations with preterm birth and miscarriage, warranting specific written accommodations rather than blanket work restriction.
Last updated: September 2026
Adult Lifespan Immunization Schedules
Vaccination is a direct midwifery responsibility. The Advisory Committee on Immunization Practices (ACIP) publishes updated adult immunization schedules annually.
1. Human Papillomavirus (HPV) Vaccine (9-Valent Recombinant / Gardasil-9)
- Antigenic Coverage: Protects against low-risk types 6 and 11 (responsible for >90% of anogenital warts / condylomata acuminata) and oncogenic high-risk types 16, 18, 31, 33, 45, 52, and 58 (responsible for ~90% of cervical, anal, vulvar, vaginal, and oropharyngeal cancers).
- Dosing Schedules:
- 2-Dose Series (0, 6–12 months): For individuals initiating the series before their 15th birthday (ages 9 through 14 years). The minimum interval between doses is 5 months.
- 3-Dose Series (0, 1–2, 6 months): For individuals initiating the series on or after their 15th birthday (ages 15 through 26 years), and for all immunocompromised individuals (HIV infection, solid organ transplant) regardless of age at initiation.
- Catch-Up & Extended Age Indications: Routine catch-up vaccination is recommended for all persons through age 26 years. For adults aged 27 through 45 years who are not adequately vaccinated, clinical shared decision-making is recommended; while most adults have had prior HPV exposure, vaccination provides protection against vaccine types not yet acquired.
2. Tetanus, Diphtheria, and Acellular Pertussis (Tdap / Td)
- Pregnancy: 1 dose of Tdap administered during EACH pregnancy, ideally between 27 and 36 weeks of gestation, regardless of the patient's prior vaccination history or interval since the last Tdap. Maximizes maternal IgG synthesis and transplacental transfer, conferring passive neonatal protection against whooping cough.
- Non-Pregnant Adults: Non-pregnant adults should receive 1 lifetime booster of Tdap, followed by a Td or Tdap booster every 10 years.
3. Influenza & COVID-19
- Influenza: Annual quadrivalent inactivated or recombinant influenza vaccine for all individuals aged 6 months and older, administered each autumn. The live attenuated influenza vaccine (LAIV / nasal spray) is strictly contraindicated in pregnancy and immunocompromised states.
- COVID-19: Annual updated formulation administered per CDC/ACIP guidelines.
4. Recombinant Zoster Vaccine (RZV / Shingrix)
- Indications: 2-dose series administered intramuscularly (separated by 2 to 6 months) for all immunocompetent adults aged 50 years and older, and for immunocompromised adults aged 19 and older.
- Administered regardless of whether the patient has a documented history of chickenpox (varicella) or prior receipt of the live zoster vaccine (Zostavax). Shingrix provides >90% efficacy in preventing shingles and postherpetic neuralgia.
5. Pneumococcal Vaccination
- Indications for Age ≥65 Years: For all immunocompetent adults aged 65 years and older who have not previously received a pneumococcal conjugate vaccine:
- Single dose of PCV20 (20-valent pneumococcal conjugate vaccine) alone, OR
- Single dose of PCV15 (15-valent conjugate vaccine) followed by PPSV23 (23-valent polysaccharide vaccine) administered at least 1 year later.
- Younger adults (aged 19 to 64) with chronic medical conditions (chronic lung disease, diabetes, cigarette smoking, alcoholism) or immunocompromising conditions qualify for early vaccination.
Environmental and Occupational Exposure Screening
The blueprint's final primary-care task is to screen and counsel about exposure to environmental or work hazards such as toxic chemicals or radiation — a task that is routinely skipped and routinely tested.
Taking the Exposure History
A workable screen fits in four questions:
- What is your job, and what do you actually handle or breathe there? (Job title alone is not enough — ask about solvents, pesticides, metals, dusts, fumes, radiation, heat, noise, and whether personal protective equipment is available and used.)
- What are your hobbies? (Stained glass and bullet casting mean lead; furniture refinishing and ceramics mean solvents and metals.)
- What is your home like? (Housing built before 1978 means lead paint; private well water means arsenic, nitrate, and bacterial testing; recent renovation means dust.)
- Does anyone in the household bring work exposures home on clothing or shoes?
Reproductive Hazards Worth Knowing
| Exposure | Reproductive Concern | Counseling |
|---|---|---|
| Lead | Crosses the placenta freely; neurodevelopmental impairment, miscarriage, hypertension. The CDC blood lead reference value is 3.5 mcg/dL; pregnancy raises maternal bone turnover and releases stored lead | Test when risk factors exist (immigration from a high-exposure country, pica, occupational or hobby exposure, old housing); adequate calcium and iron reduce absorption |
| Mercury | Methylmercury from predatory fish is a fetal neurotoxin | Follow the fish-consumption guidance from the antepartum nutrition section |
| Organic solvents | Glycol ethers, toluene, and perchloroethylene are linked to miscarriage and anomalies | Ventilation, substitution, PPE, or reassignment of duties |
| Pesticides | Organophosphates are associated with neurodevelopmental effects | Avoid application and re-entry intervals; wash produce |
| Antineoplastic drugs and anesthetic gases | Health-care occupational exposure linked to miscarriage | Closed-system transfer devices, scavenging systems, PPE per NIOSH |
| Ionizing radiation | Fetal doses below 50 mGy (5 rad) have not been associated with anomalies or loss; the occupational limit for a declared pregnant worker is 5 mSv (0.5 rem) for the whole gestation, with 0.5 mSv per month | Dosimetry badges, declaration in writing, shielding; a single diagnostic radiograph almost never approaches the threshold |
| PFAS, BPA, phthalates | Endocrine disruptors; associations with hypertensive disorders and altered development | Reduce plastic food storage and heating; filter drinking water when contamination is documented |
| Fine particulate air pollution and extreme heat | Associated with preterm birth and low birth weight | Advise avoiding outdoor exertion during high-heat or high-AQI days |
Physical Job Demands
Prolonged standing beyond about 4 hours, repeated heavy lifting, and rotating night shift work carry modest associations with preterm birth and miscarriage. The midwife's role is to document the demands and, when indicated, write specific accommodation recommendations rather than a blanket "no work" note.
Legal Protections to Name
- The Pregnant Workers Fairness Act requires covered employers to provide reasonable accommodations for known limitations related to pregnancy, childbirth, or related conditions.
- The PUMP Act guarantees break time and a private, non-bathroom space to express milk for up to one year after birth.
- FMLA provides job-protected leave for eligible employees.
Where to Send Questions
Employers must supply Safety Data Sheets for workplace chemicals. For exposure-specific counseling, use MotherToBaby (teratogen information specialists), the regional Pediatric Environmental Health Specialty Unit (PEHSU), NIOSH, and Poison Control.
Test Your Knowledge
A 51-year-old healthy female presents to the midwifery clinic for an annual health maintenance evaluation. She received the full childhood vaccine series, an updated annual influenza vaccine last month, and a Tdap booster at age 45. She has never received an HPV vaccine, varicella zoster vaccine, or pneumococcal vaccine. She had varicella (chickenpox) as a child. In accordance with Advisory Committee on Immunization Practices (ACIP) guidelines, which immunization should the certified nurse-midwife recommend and administer at this visit?
A
B
C
D