Nasal mucosal IgA levels against SARS-CoV-2 and seasonal coronaviruses are low in children but boosted by reinfection

Alexander C. Dowell, Gokhan Tut, Jusnara Begum, Rachel Bruton, Christopher Bentley, Megan Butler, Grace Uwenedi, Jianmin Zuo, Annabel A. Powell, Andrew J. Brent, Bernadette Brent, Frances Baawuah, Ifeanyichukwu Okike, Joanne Beckmann, Shazaad Ahmad, Felicity Aiano, Joanna Garstang, Mary E. Ramsay, Paul Moss^*, Shamez N. Ladhani^*

^*Corresponding author for this work