Between about late March and September each year in the UK most of us are able to generate enough vitamin D from sunlight exposure, but from the months of October to March our bodies do not get enough vitamin D from sunlight. A lack of vitamin D affects teeth, muscles and can lead to bone deformities. Whilst there isn’t specific evidence that vitamin D affects aspergillosis, deficiency has been linked with other chronic illnesses.

Vitamin D can be found in foods such as oily fish, red meat and egg yolks but the NHS recommends that everyone takes vitamin D supplements between October to March to ensure we have sufficiently high levels. The recommended dose for adults and children over 1 is 10 micrograms (or 400 IU) per day.

Vitamin D supplements can be bought from most pharmacies or supermarkets.