Respiratory - Dermal - Gastrointestinal - Neuro & Nervous - Multi-systemic - Phages
Websites that I like to use as a reference.
Here, you can also read about a species's real-life counterpart.
Only species that are actually featured in both Virus Attack and its prequels, are described here.
SARS-CoV-2 is the main character in all three stories, which is why I created the most lore for this virus, so it has an entire page of its own.