# Commission Implementing Decision (EU) 2018/945 of 22 June 2018 on the communicable diseases and related special health issues to be covered by epidemiological surveillance as well as relevant case definitions (Text with EEA relevance), Division: Notes:

Extent: E+W+S+N.I.

One definitive chest X-ray or CT-scan for the current pneumonia episode may be sufficient in patients with underlying cardiac or pulmonary disease if comparison with previous X-rays is possible.
PN 1 and PN 2 criteria were validated without previous antimicrobial therapy. However, this does not exclude the diagnosis of PN 1 or PN 2 in case of previous antimicrobial use.

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Source: https://www.legislation.gov.uk/eudn/2018/945/annex/II/division/4/division/4.1/division/4.1.10/annotation/1 (the official version)
Page: https://openlegislation.uk/eu-decision-2018-945/annex-II/division-4/division-4.1/division-4.1.10/annotation/1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.