Innovative vaccination tool for chickenpox. It combines some peculiarities such as the certainty of the right dose for each treated bird, safety for the operator, speed of execution, ease of use, full compliance with the rules of use of the pharmaceutical company holding the vaccine. The device is equipped with an automatic actuator powered by a battery, able to ensure for each refill several tens of thousands of cycles. The fork supplied as an accessory by the pharmaceutical company itself, is fixed on a slider that runs in a protected guide. This is activated by a sensor when it detects the presence of the wing placed by the operator in its housing. The passage of the fork through the wing membrane releases the adequate quantity of vaccine, carried by adherence on the recess of the needles dipped in an appropriate container.