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. 2014 Aug 21:504–520. doi: 10.1016/B978-0-444-52512-3.00183-2

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Copyright © 2014 Elsevier Inc. All rights reserved.

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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(a) Lung and air sacs. (b) Lung from naturally infected chickens showing numerous caseous nodules characteristic of respiratory asperigllosis.

Photo (a) was provided by Natàlia Majó i Masferrer, SDPV (Servicio de Diagnóstico de Patología Veterinaria)-CReSA (Centre de Reserca en Sanitat Animal, Barcelona) and Photo (b) was provided by Alejandro Alfaro, Universidad Nacional de Costa Rica.