void infect()
{
if (game_script.units >= price)
{
game_script.units -= price;
GameObject new_infected = Instantiate(infected_prefab, this.gameObject.transform.parent.parent);
new_infected.tag = this.gameObject.tag;
infected infected_script = new_infected.GetComponent <infected>();
infected_script.lifetime = lifetime;
infected_script.income = income;
infected_script.start_counting();
}
else
{
}
}
