Defervescence expected within 48-72 hours of doxycycline
Persistent fever > 72 hours: reassess diagnosis and antibiotic choice
Serial CRP and LDH for treatment response
Follow-up chest imaging
Radiographic resolution lags clinical recovery
CT at 4-6 weeks post-discharge; full resolution may take 90 days
Patient Discharge Instructions
copy discharge instructions
Diagnosis and cause
You have been diagnosed with psittacosis (parrot fever)
This is a lung infection caused by a bacteria from birds
You likely caught it from contact with an infected bird or its droppings
This infection responds well to the right antibiotics (doxycycline)
Most people recover fully within 1-2 weeks on treatment
Antibiotic instructions
Take doxycycline exactly as prescribed for the full course
Do not stop early even if you feel better
Stopping early can cause the infection to come back
How to take doxycycline correctly
Take with a full glass of water
Do not take with dairy products, antacids, calcium, or iron supplements
Wait at least 2 hours between doxycycline and these substances
Side effects to expect
Nausea is common; take with food if needed
Increased sensitivity to sunlight: wear sunscreen and protective clothing
Heartburn or throat irritation: do not lie down for 30 minutes after taking
Activity and recovery
Rest and adequate hydration are essential for recovery
Drink at least 6-8 glasses of water daily
Avoid strenuous activity until fever-free for at least 48 hours
Fatigue may persist for 1-2 weeks after infection resolves
Chest X-ray or CT may not appear normal for up to 3 months
This does not mean the infection is still active
Bird and household precautions
Do not resume handling birds until source is identified and treated
Have your bird evaluated and treated by a veterinarian
Infected birds can appear healthy but still carry the bacteria
Household hygiene measures
Wear a mask and gloves when cleaning bird cages
Ensure good ventilation in rooms with birds
Wash hands thoroughly after any bird contact
Inform household members who had bird contact
They should see a doctor if they develop fever, cough, or headache
Follow-up care
Return to your doctor or clinic in 1-2 weeks
Bring your remaining medication to confirm course completion
Blood tests may be repeated to confirm resolution
Repeat chest imaging at 4-6 weeks if recommended by your doctor
Return to emergency department immediately if any of the following occur
Worsening shortness of breath or chest pain
Inability to breathe comfortably at rest
Return of high fever after initial improvement
Temperature >= 38.5 C after 48 hours of antibiotics
New confusion, severe headache, or neck stiffness
These may indicate spread of infection to the brain
Swelling or pain in one leg
Blood clots are a risk with this infection
Inability to keep antibiotics down due to vomiting
IV antibiotics may be needed
References
Guidelines and key sources
Ni Y, Zhong H, Gu Y, et al. Clinical features, treatment, and outcome of psittacosis pneumonia: a multicenter study. Open Forum Infectious Diseases. 2023.
Multicenter study on clinical features and outcomes; doxycycline 95.7% vs fluoroquinolone 31.0% cure rate
PubMed PMID 36817742
Li X, Xiao T, Hu P, et al. Clinical, radiological and pathological characteristics of moderate to fulminant psittacosis pneumonia. PLoS One. 2022.
Li J, Xue Y, Cui J, et al. Admission clinical features associated with disease severity in psittacosis pneumonia: a retrospective study. Diagnostic Microbiology and Infectious Disease. 2026.
Myocardial injury OR 124.3 for severe disease; D-dimer AUC 0.765
PubMed PMID 41734523
Song Y, Li N, Ni W. Systemic inflammation, multi-organ injury, and acute kidney risk in psittacosis pneumonia. Frontiers in Cellular and Infection Microbiology. 2025.
AKI in 34% psittacosis vs 12% typical CAP; BUN-to-albumin ratio AUC 0.88
PubMed PMID 41878259
Wallensten A, Fredlund H, Runehagen A. Multiple human-to-human transmission from a severe case of psittacosis, Sweden, January-February 2013. Euro Surveillance. 2014.
Human-to-human transmission documentation; index case to 10 contacts
PubMed PMID 25358043
Zhang Z, Zhou H, Cao H, et al. Human-to-human transmission of Chlamydia psittaci in China, 2020. The Lancet Microbe. 2022.
Secondary and tertiary transmission chain confirmed
PubMed PMID 35617977
Wu HH, Feng LF, Fang SY. Application of metagenomic next-generation sequencing in the diagnosis of severe pneumonia caused by Chlamydia psittaci. BMC Pulmonary Medicine. 2021.
mNGS diagnostic utility; BAL superior to NP swab for PCR
PubMed PMID 34556069
McGovern OL, Kobayashi M, Shaw KA, et al. Use of real-time PCR for Chlamydia psittaci detection in human specimens during an outbreak of psittacosis — Georgia and Virginia, 2018. MMWR. 2021.
PCR detection rates: 59% sputum/BAL vs 7% NP swab
PubMed PMID 33830980
Raven S, Heijne M, Koomen J, et al. Circulation of avian Chlamydia abortus in the Netherlands and community-acquired pneumonia: an outbreak investigation. The Lancet Infectious Diseases. 2025.
Incubation period 7-14 days; clinical spectrum and outbreak epidemiology
PubMed PMID 39426392
Beeckman DS, Vanrompay DC. Zoonotic Chlamydophila psittaci infections from a clinical perspective. Clinical Microbiology and Infection. 2009.
Shi L, Zhang D, Yang Q, Yang J, Zhu H. Distinction of clinical features between Chlamydia psittaci and Legionella pneumophila pneumonia. Annals of Medicine. 2024.
Differential diagnosis: comparative clinical and microbiological features
PubMed PMID 39541434
IDSA/ATS Consensus Guidelines on the Management of Community-Acquired Pneumonia in Adults. Clinical Infectious Diseases. 2007.
IDSA/ATS major and minor criteria for severe CAP
Severity scoring and disposition guidance
SymptomDx is an educational tool for medical professionals. It does not replace clinical judgment. Verify all clinical data and drug dosages with authoritative sources.