Swollen head in lovebirds- Why?

One of my client rang me up two days back with a symptom of swollen head in her lovebird. Immediately I rushed and inspected the bird, it showed following symptoms: -

1. Ruffled feather
2. Swollen ear lobes
3. Swollen head
4. Lacrimation (watering of eyes)
5. Rotten smell nasal discharge

 This clearly suggestive of infectious coryza.  Infectious coryza is a specific respiratory disease in pet birds that occurs most often in semi-mature or adult birds caused by Hemophilus paragallinarum bacterium.

Transmission is by contact between birds. Other predisposing factors include ingestion of contaminated food stuff and water, and inhalation of infected aerosols. Improving the hygiene, and proper disposal of dead birds are the measures to prevent infectious coryza.

Antibiotics such as tetracycline, enrofloxacin may be useful to prevent further spread of this disease of head swelling in lovebirds..