Lab tests are not cheap. We are not vets and cannot replace them because our advice is always only reliant on what our members report without recourse to the piggy itself - and that is often not the whole picture. We can also not necessarily judge how severe the reported symptoms are because for aworried and anxious owner any symptom can be massive while others ask for support in a small detail when their piggies are fighting for their lives...
A URI is a bit like a bacterial human chest infection or pneumonia, but NOT like a viral human flu (they don't get that) if that helps you? Only stronger and often getting bad a lot more quickly - sometimes within hours.
If your piggies stop eating because they are struggling to breathe, then you need to see a vet ASAP. if their sides are noticeably heaving, they are struggling for their lives as all their strength is going into the next breath.
Guinea Lynx :: URI