Immunizations and adult screening: what to give, when to hold it and who to screen
NCLEX-RN topic: Health promotion / disease prevention
- Vaccines are primary prevention; screening is secondary prevention.
- Adults get flu vaccine yearly and a Td or Tdap every 10 years.
- Give Tdap in each pregnancy; no MMR or varicella during pregnancy.
- Hold a vaccine after anaphylaxis to a previous dose, not for mild illness.
- A positive screen is not a diagnosis; confirm it with more testing.
Key facts
- Primary prevention stops disease before it starts (vaccines, healthy habits); secondary prevention finds it early (screening); tertiary prevention limits the effects of disease the client already has.
- CDC adult schedule: 1 dose of influenza vaccine every year; Td or Tdap every 10 years; 1 dose of Tdap during each pregnancy, preferably early in weeks 27–36.
- Adults 50 and older receive 2 doses of recombinant zoster vaccine, 2–6 months apart.
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- MMR and varicella vaccines are contraindicated during pregnancy; a client without immunity receives them after the birth, before discharge.
- A severe allergic reaction (such as anaphylaxis) after a previous dose or to a vaccine component is a contraindication; a moderate or severe acute illness is a precaution.
- USPSTF: screen all adults 18 and older for high blood pressure, and adults 35–70 with overweight or obesity for prediabetes and type 2 diabetes.
- USPSTF: screen adults for depression and adults 18–79 for hepatitis C.
Quick check1 question · 2 more at the end
Four clients are due for a vaccine at a clinic today. Which finding is a reason for the nurse to withhold the vaccine and notify the provider?
Correct answer: B.
A contraindication is a condition that increases the risk of a serious adverse reaction, and a severe allergic reaction such as anaphylaxis after a previous dose or to a vaccine component is a contraindication. Mild acute illness with or without fever, current antimicrobial therapy and allergies to nonvaccine substances such as penicillin are not reasons to withhold a vaccine. Moderate or severe acute illness is a precaution, and vaccination is usually deferred.
A Incorrect: a mild acute illness with or without fever is not a contraindication or precaution.
B Correct: a severe allergic reaction such as anaphylaxis after a previous dose is a contraindication.
C Incorrect: current antimicrobial therapy is not a reason to withhold a vaccine.
D Incorrect: a penicillin allergy or other nonvaccine allergy is not a contraindication.
Full lesson
Each part starts with its main idea. Open a part when you want the details.
The short answer: Vaccines are primary prevention and screening is secondary prevention. On the CDC adult schedule, adults get influenza vaccine yearly, a Td or Tdap booster every 10 years and Tdap in each pregnancy. Hold a vaccine after anaphylaxis to a previous dose, avoid live vaccines in pregnancy, and don't delay for a mild illness. A positive screen needs confirmation.
1 How do vaccines and screening fit the levels of prevention?Vaccines prevent disease, screening finds it early, and tertiary care limits harm from disease the client already has. 1 min
Vaccines prevent disease, screening finds it early, and tertiary care limits harm from disease the client already has. Knowing the level helps you match each intervention to the client's situation.
| Level | Goal | Examples |
|---|---|---|
| Primary | Prevent illness before it starts | Immunizations, physical activity, sunscreen, quitting tobacco |
| Secondary | Detect disease early, often before symptoms | Blood pressure checks, mammograms, depression screening |
| Tertiary | Reduce the severity and effects of existing disease | Self-management teaching for a chronic condition, rehabilitation, support groups |
2 What does the current CDC schedule say?Immunization schedules change, so always check the current CDC schedule before you teach or give a vaccine. 1 min
Immunization schedules change, so always check the current CDC schedule before you teach or give a vaccine. The points below match the CDC schedule pages (addendum updated July 2025).
Adults (19 and older)
- Influenza: 1 dose every year.
- Td or Tdap: a booster every 10 years after the primary series.
- Pregnancy: 1 dose of Tdap during each pregnancy, preferably early in weeks 27–36.
- Recombinant zoster: 2 doses, 2–6 months apart, starting at age 50.
- MMR and varicella: contraindicated during pregnancy. A client without immunity gets a dose after the birth, before discharge.
Children: MMR and varicella are each a 2-dose series at 12–15 months and 4–6 years, and a Tdap booster is given at 11–12 years.
3 When should a vaccine be held or delayed?Hold or delay a vaccine only for a true contraindication or precaution, because unnecessary delays leave the client unprotected. 1 min
Hold or delay a vaccine only for a true contraindication or precaution, because unnecessary delays leave the client unprotected. A contraindication raises the risk of a serious adverse reaction, so the vaccine is not given. A precaution might raise that risk, so the vaccine is usually deferred unless the benefit outweighs the risk.
| Hold (contraindication) | Usually delay (precaution) | Not a reason to delay |
|---|---|---|
| Severe allergic reaction, such as anaphylaxis, after a previous dose or to a vaccine component | Moderate or severe acute illness, with or without fever | Mild illness with or without fever |
| Live vaccines in pregnancy | Current antibiotics; recent exposure to an infection | |
| Live vaccines in severe immunosuppression (generally) | Penicillin or other nonvaccine allergy | |
| A pregnant mother or household contact (MMR, varicella) |
4 Which adults should be screened?The USPSTF grades screening by evidence, and A and B recommendations are the ones to know. 1 min
The USPSTF grades screening by evidence, and A and B recommendations are the ones to know. Every positive screen leads to further assessment or repeat testing to confirm a diagnosis.
| Condition | Who the USPSTF says to screen |
|---|---|
| High blood pressure | Adults 18 and older, with office readings; confirm outside the clinic before diagnosis |
| Prediabetes and type 2 diabetes | Adults 35–70 with overweight or obesity |
| Depression | Adults, including pregnant and postpartum clients |
| Hepatitis C | Adults 18–79 |
| Colorectal cancer | Adults 45–75 |
| Breast cancer | Women 40–74, mammogram every 2 years |
5 What the nurse doesThe nurse screens each client for contraindications, gives due vaccines and links screening results to follow-up. 1 min
The nurse screens each client for contraindications, gives due vaccines and links screening results to follow-up.
- Assess: review vaccine records; ask about past reactions, pregnancy, immune problems and how sick the client feels today.
- Priority action: withhold the vaccine and notify the provider when a contraindication is found; do not delay for a mild illness.
- Teach: explain what each screening looks for and what happens after a positive result.
Common mistakes
The traps students fall into most. Read these before you practice.
Watch out: A mild illness with or without fever, current antibiotics or a recent exposure is not a reason to skip a vaccine; a moderate or severe illness is a reason to delay.
Watch out: A penicillin or other nonvaccine allergy is not a contraindication; anaphylaxis after a previous dose of that vaccine is.
Watch out: A pregnant mother or household contact does not stop a child from getting MMR or varicella vaccine.
Watch out: A positive screen is not a diagnosis; it leads to further testing or assessment to confirm.
Watch out: High clinic blood pressure readings are confirmed with home or ambulatory readings before hypertension is diagnosed and treated.
How to remember it
Three short phrases cover the levels of prevention and the vaccine holds. Memory hook: "Prevent, detect, limit" for primary, secondary and tertiary prevention. For holds: "Anaphylaxis holds, pregnancy blocks live, sniffles don't stop."
Self-check:
- Name the level of prevention for a yearly influenza vaccine and for a mammogram.
- List two findings that are not reasons to delay a vaccine.
- State the age range for USPSTF hepatitis C screening.