Why is this script doing this?

The script I have here I am using to(at random) select someone to be on the orange team. The problem is that when there are two(or more) people on the game it runs it for the amount of players on the game.

players = game.Players:GetPlayers()
for i,v in pairs(game.Players:GetPlayers()) do
if #players >= 1 then
    first_infected = players[math.random(1, #players)]
    first_infected.TeamColor = BrickColor.new("Bright orange")--This is all in a function so it will run.

So my question is: How can I make it so it only changes the team of one person at one time? Hope this make sense

Thanks