New sterilisation air filters are a news event which affects the way a plague spreads from country to country. This may happen with airplanes or ships. Only advanced water or airborne diseases can avoid these filters. Air I for airplanes and Water I for boats must be acquired to avoid the filters.
The news event says the following:
- (Airplanes or ships) use new sterilisation air filters: New air filters are now being used to stop airplanes transmitting any disease between countries. Only advanced airborne/waterborne diseases can survive on them