Bird flu in Australia does warrant attention, though not alarm at this stage. One confirmed case in Sydney means the virus is circulating, but authorities have detection and containment systems ready for exactly this kind of situation. The key things are basic hygiene - wash hands after handling raw poultry, don't touch sick or dead birds - and staying informed through official health channels rather than panic-buying based on news headlines.
The environmental pressures you mentioned (El Niño patterns, wildlife stress) can make conditions more favorable for disease spread, so it's worth keeping an eye on official updates over the coming weeks. but right now, the risk to the average person going about their day remains quite low. If you're in a high-risk group - working with poultry or wildlife - then more caution is warranted; otherwise, standard food safety and awareness is enough. Health authorities will escalate messaging if the situation changes, so you won't miss important information if you just check reliable sources occasionaly.