Legionnaires' disease a spring risk

Health authorities are reminding gardeners to take precautions against Legionaires disease this summer season. Photo Bevan Conley.

Te Whatu Ora is urging green-fingered kiwis to guard against Legionnaires' disease during the spring and summer gardening season.

Legionnaires' disease or legionellosis is an uncommon but dangerous "gardener's pneumonia". There are various types, but one of the main strains is often caused by bacteria found in compost and potting mixes.

Medical Officer of Health Dr David Sinclair, from the National Public Health Service, says case numbers in New Zealand often spike in September, October and November during spring gardening season.

"Legionnaires' disease can be fatal, but it's also very easy for gardeners to protect themselves against it," Dr Sinclair said.

"By following a few simple precautions you can reduce your risk when handling compost and potting mix. Most importantly dig out a well-fitting face mask to wear, put on gloves, damp down soil and wash your hands when you're done."

Public health services across New Zealand have already started seeing a rise in springtime Legionnaires' disease notifications.

In the Auckland region case numbers for all types of Legionnaires disease this year are the highest they've been in five years, while nationally there have been more than 140 cases in the year to date.

Typically, about 60 per cent of Legionnaires' disease cases each year are the longbeachae strain, which is linked to bacteria in compost and potting mix.

Te Whatu Ora is keen to reduce the risk of further cases this year, particularly given the serious health outcomes Legionnaires' disease can cause.

"The disease is uncommon but it can be really severe, so it's important to take it seriously," added Dr Sinclair.

"The risk is higher for older people, as well as those who smoke, have lung conditions or a weakened immune system. As it can't be spread from person to person it's quite simple to keep yourself safe.

"Gardeners just need to remember to gear up when they get out there this Labour weekend and beyond."

Ways to prevent catching Legionnaires disease:

- Work outside. Work with compost or potting mix in a well-ventilated outdoor area.
- Wear a well-fitting face mask. An N95 or respirator is best.
- Wear gloves when handling potting mix or compost.
- Cut – don't rip. Carefully open bags of compost or potting mix using scissors and also away from your face.
- Compost dry? Damp it down. Reduce dust by dampening down compost or potting mix before using.
- Wash your hands thoroughly with soap and water. Do this after handling potting mix or compost and before touching your face or removing your mask.