Looks like Vibriosis. Check your water perameters. Do a large 50%+ water change and treat with antibiotics such as Oxytetracycline or Erythromycin you need an antibiotic that will kill gram-negative bacteria.
Yes it is. To be on the safe where rubber gloves incase you have any small cuts on your hands. Keep the water very clean, don't raise the temp above 80F and follow the instructions on the packege for dosing.