Give vita pro combo,good bacteria it,also Strike probiotic has been giving good results in S.Wales especially with yb problems,can only say it as it is.
5ml.per gallon Virkon s. especially when there is disease about,can individually syringe a sick bird with it,kills nasties in crop, if you are short on other stuff to use it is good.
Always look onM4 Webcams give a good idea of conditions in general,just Google Road and add Webcams so M4 Webcams West bound or East bound to have a look around.
You can jab under the loose skin at the top of the leg if you are not confident of injecting in the neck,we always go with the leg,much better,tip from the late Bill Cowan(Bilco)and is a good one.