Introduction:
The scope of the poster is to present the respond to a public health event at the port of Thessaloniki in 2019. The goal was to prevent the spread of a vectorborne disease, malaria. The Port Health Authority (PHA) received information from the Port Police Authority (PPA) of Thessaloniki, that a cargo ship due to arrive at the port of Thessaloniki, during its voyage from the Ivory Coast disembarked on 23rd of July 2019 in Almeria, Spain a crew member who fell ill with malaria due to Plasmodium falciparum^1-3. The Almería port health authority recommended the Captain to perform disinsection on the ship. Carrying out of disinsection should be checked in the next port of call-Thessaloniki.

Methods:
We used two methods in order to prevent disease spread: 1. Performed disinsection on board: Indoor residual spraying (IRS) in closed areas of the 4 decks: cabins, galleys, storage, bridge) and outdoor residual spraying (ORS) in open spaces of the ship and in the port area closed to the ship. 2. screening of the 21 crew members active surveillance for malaria cases (temperature checking, questions about current or recent illness - malaria case criteria)

Results:
The PHA took actions in chronological order: 1. before the ship anchored the port: Sent information material to the ship agent (mosquito control measures -approved biocides etc.-, personal protection measures against mosquito bites) to inform crew members. 2. Immediately after its berth: a Doctor, a Public Health Inspector and employees of the mosquito control company in the Region of Central Macedonia (RCM) boarded the ship to perform: screening of the crew (no findings were obtained), disinsection on board, before the officers debarked the ship, they recommended the crew to immediate report of relevant symptoms and take all necessary measures to avoid exposure to mosquito bites⁴.

Conclusions:
The early warning - notification of the PPA of Thessaloniki about the disembarked crew member in Spain led the PHA to take actions in order to prevent a disease spread. The detailed information about the case and the advice given by the Port Authority in Spain was available through the Eu Healthy Gateways members, who were in direct email and phone contact with them⁵. The use of the electronic communication platform SIS is important for recording health risk events.