What is seasonal influenza?
In short A contagious viral infection that attacks the nose, throat, and lungs. In older adults it can progress quickly to pneumonia, worsen heart failure or COPD, and increase stroke or heart attack risk in the weeks after infection.
Key window: Antiviral medicines work best if started within the first 48 hours of symptoms—earlier is better.
Typical symptoms in older adults
- Sudden fever or feeling feverish/chills (fever may be mild/absent in seniors)
- Dry cough, sore throat, runny/stuffy nose
- Headache, muscle or body aches, extreme tiredness
- Shortness of breath, chest tightness, wheeze (especially with COPD/asthma)
- Confusion, dizziness, poor appetite, or falls (common atypical signs)
Related topics
- Shortness of Breath · COPD · Heart Failure (CHF)
- Dehydration · Falls (Injury Prevention)
When to seek urgent care
- Blue/gray lips, severe shortness of breath, chest pain, or new confusion
- High fever that won’t settle, repeated vomiting, inability to drink/pee
- Symptoms improving then suddenly worse (secondary pneumonia)
- Worsening COPD/asthma or heart failure signs (swelling, breathlessness)
Call your local emergency number if these occur.
Who is at higher risk
- Age ≥65, frailty, nursing-home residence
- Heart or lung disease (CHF, CAD, COPD, asthma)
- Diabetes, kidney disease, neurological conditions, obesity
- Weakened immunity or cancer treatment
Testing: when and how
When to test
- Within the first 1–2 days of symptoms (or anytime for those very ill/hospitalized)
- During local outbreaks or flu season with typical symptoms
How testing is done
- Rapid antigen or PCR swab from nose/throat
- Some clinics test for both flu & COVID at once
Treatment (antivirals)
Start early
- Antivirals work best if started within 48 hours of symptoms—may still help later in severe or high-risk cases
- Common options: oseltamivir (pill), baloxavir (single dose), or inhaled zanamivir (not for severe lung disease)
Safety & adjustments
- Kidney disease often requires dose changes—review with your clinician
- Watch for nausea or neuropsychiatric effects; report unusual symptoms
- Continue usual heart, lung, and diabetes medicines unless told otherwise
Home care & hydration
Fluids & fever
- Small frequent sips; oral rehydration or broths if appetite is low
- Acetaminophen for fever/aches if approved for you; avoid duplicate products
Breathing & rest
- Head-of-bed elevation, paced breathing; use prescribed inhalers correctly
- Light activity between rests to reduce deconditioning and clots risk
Reduce spread
- Stay home until fever-free for 24 hours without fever-reducers
- Mask around others, open windows, clean high-touch surfaces
Vaccines & prevention
Best timing
- Get vaccinated each season—ideally before local circulation increases
- Protection builds over ~2 weeks after the shot
Vaccine types for 65+
| Type | What’s different | Notes |
|---|---|---|
| High-dose inactivated | More antigen | Designed to produce a stronger immune response in seniors |
| Adjuvanted inactivated | Immune booster (adjuvant) | Another good option for ≥65 |
| Standard-dose | Regular antigen amount | Use if high-dose/adjuvanted not available—don’t delay vaccination |
Around the home
- Caregivers and family members should be vaccinated
- Wash hands, cover coughs, and ventilate rooms
Flu vs. cold vs. COVID
| Feature | Flu | Common cold | COVID-19 |
|---|---|---|---|
| Onset | Sudden | Gradual | Varies |
| Fever/aches | Common, prominent | Mild | Common |
| Cough | Dry, bothersome | Mild–moderate | Common |
| Taste/smell loss | Uncommon | Uncommon | More common |
| Testing | Flu swab | Usually none | COVID test |
Because symptoms overlap, combined testing may be recommended.
Quick answers
Do I still need the shot if I had flu last year?
Yes—viruses change and immunity fades. Get vaccinated every season.
Can I take antivirals if I also have COVID?
Yes—your clinician may treat both, depending on timing and risk. Bring a full medication list to check interactions.
How long am I contagious?
From about a day before symptoms until at least 5–7 days after they start—longer if very ill or immunocompromised.
Egg allergy and the vaccine?
Most people with egg allergy can get any age-appropriate flu vaccine; ensure vaccination is in a setting that can manage rare reactions.
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