[willsuckformoney]

That would have to be

pawn Код:

new Infected = random(1);

Also if I get this right you can just

pawn Код:

for(new i = 0; i < MAX_PLAYERS; i++)
{
    new Float:X,Float:Y,Float:Z;
    GetPlayerPos(playerid,X,Y,Z);
    if(IsPlayerInRangeOfPoint(i,5,X,Y,Z))
    {
        //Your stuff
    }
}

That was just because I'm not sure what exactly you mean.