It appears from looking on other bird forums and media, that Trichomoniasis is still around and taking a heavy toll on Greenfinches. Unfortunately this disease is deadly and seems to affect mainly Greenfinches and Pigeons.
The signs to look for are swollen throats, matted featers around the mouth and throat, lethargy and the inability to swallow food.
If you see signs of this, then it is advised to stop feeding for a couple of weeks, disinfect all feeding surfaces, retain only the nut type feeders for Blue tits etc and empty any static water sources, as the disease spreads through saliva.
Below is a picture of a stricken Pigeon. Click on the thumbnail to enlarge.
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