Cast your mind back to 2017, when The Ordinary launched its serum foundation. Costing less than £6 (at the time) and with added skincare benefits, it soon amassed a waiting list of more than 25,000.

Samples [serum, broncho-alveolar lavage fluid (BALF), lymph nodes, and lungs] were collected 24 h after the last HDM challenge. Stocks of influenza virus (A/PR8/34) were grown in Madin-Darby canine ...