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1. Following an alert notified pursuant to Article 19 concerning a serious cross-border threat to health referred to in Article 2(1), point (a)(iii), or in Article 2(1), point (b), (c) or (d), Member States shall, in liaison with the Commission and on the basis of the available information from their monitoring systems, inform each other through the EWRS and, if the urgency of the situation so requires, through the HSC, about developments at national level with regard to the serious cross-border threat to health concerned.

2. The European Surveillance Portal for Infectious Diseases operated by the ECDC shall be used for ad hoc monitoring of a serious cross-border threat to health referred to in Article 2(1), point (a)(iii), or in Article 2(1), point (b), (c) or (d).

3. The information transmitted pursuant to paragraph 1 shall include, in particular, any change in the geographical distribution, spread and severity of the serious cross-border threat to health concerned and in the means of detection, if available.

4. The Commission shall, by means of implementing acts, adopt, where necessary, the case definitions to be used for ad hoc monitoring, in order to ensure the comparability and compatibility at Union level of the collected data. Those implementing acts shall be adopted in accordance with the examination procedure referred to in Article 29(2). On duly justified imperative grounds of urgency related to the severity of a serious cross-border threat to health or to the rapidity of its spread between the Member States, the Commission may adopt or update the case definitions referred to in the first subparagraph of this paragraph through immediately applicable implementing acts in accordance with the procedure referred to in Article 29(3).