If I had strap throat this is what I would do
Make a decoction of white oak bark (see herbology lesson one posted on this forum) and gargle with it 4 times a day.
Take Echinacea extract 60 drops (this is the adult dose, see herbology lesson one posted on this forum to adjust dose for other than adult) in a little water 4 times a day for 15 days.
Homeopathic Belladonna 30c 3 pellets every 4 hours for 7 days