Special 

Editor’s Choice 2020

The gut and lung: Communication between mucosal sites

Combatting Clostridiodes difficile, harnessing MAIT cells to fight Mycobacterium TB, and models of SARS-CoV-2 infection and COVID-19

New insights into the importance of PPAR-gamma in ILC2 activity, and the missing link between B cells, the microbiota and food allergy.