Dear Dr. Tiger,
This evening I managed to cut my hand, at the base of my thumb, whilst using public transport. Should I get a tetanus shot? Maybe even the full complement of Yellow Fever and Malaria, just in case?
You should know that my hand has not as yet turned black, dropped off, or begun to rot. Nor are there maggots incubating, oddly coloured pus, or in fact anything other than a slightly sore scrape. Nonetheless, your expert advice would be welcomed.