What is latex allergy?

Latex allergy was first recognised 50 years ago. It occurs when a person develops allergic symptoms due to coming into contact with natural rubber latex (NRL). This is found in the sap of the rubber tree (Hevea brasiliensis) and is used to make a range of rubber products.

Hundreds of different allergens have been documented in natural rubber latex. Many other chemicals, added in the rubber manufacturing process, are also common allergens such as antioxidants, and various substances.

Natural rubber latex is found in many medical products in common use, such as:

• Medical gloves.

• Rubber tubes.

• Tourniquets (used when taking blood).

• Catheters.

It is also found in:

• Drinking straws.

• Balloons.

• Elastic.

• Aerosols.

• Preservativi.

• Many other everyday household items.

Dr Deborah Lee of Farmacia Online Dr Fox explains that when an allergic person comes into contact with any of these allergens, an immune reaction occurs. This leads to symptoms (see below) that can range from mild to severe depending on the person.

"Latex allergens can also be inhaled. For example, latex particles can be absorbed by corn starch, which is often added to rubber gloves, so when the pack is opened, the latex aerosol is released into the air" says Dr Fox.

Latex allergies can present themselves in different ways. In very mild cases of latex allergy, a little skin irritation may occur.

This irritation is caused by histamine, which stimulates inflammation by causing blood vessels to dilate and increase the blood flow to the area. The tissue swells, and becomes red and hot, leading to an itchy rash (dermatite da contatto).

However, in more aggressive latex allergies, a person can experience life-threatening anaphylaxis. Anafilassi occurs when your body goes into shock as your blood pressure drops suddenly, your airwaves narrow, and your pulse weakens.

Mild symptoms of latex allergy

• Occhi pruriginosi.

• Runny nose.

• Itchy back of the throat.

• Pelle irritata.

Severe latex allergy symptoms

If these occur, you must seek medical advice immediately:

• Eruzioni cutanee.

• Vesciche.

Anafilassi

This happens with severe latex allergy, which can mean:

• Swelling of the mouth, tongue, and throat.

• Difficoltà a respirare.

• Sibilo.

• Tosse.

Dr Fox highlights that acute anaphylaxis can be fatal in just 15 minutes, so immediate medical intervention is required. Here in the UK, you would call 999 for an emergency ambulance.

"Mild allergic contact dermatitis is likely to cause symptoms within 12-24 hours of exposure to latex. Allergy symptoms will persist for as long as the exposure to latex continues. After the allergen is removed, recovery is usually within a matter of hours, or after a few days," says Dr Fox.

"An allergic reaction to latex can start within a few minutes to a few hours after exposure. It can come on very quickly, which is why sufferers need to know how to manage an attack if they feel it coming on and carry an EpiPen."

Figura 1

Research suggests that 4.3% of the world's population may have a latex allergy.

Although anyone can develop a latex allergy, it is more common in certain professions where workers are regularly exposed to latex. It is thought to be more common in those working in the health sector, given how frequently staff are exposed to NRL in medical items at work.

In fact, around 15% of healthcare workers suffer from a latex allergy, including 30% of dentists and 50% of surgeons.

Dr Fox further explains that there are other risk factors to having a latex allergy.

For example, latex allergy is said to be five times more common in children with spina bifida. It has also been found to be more common in those who have had five or more surgical procedures, who have neurological conditions (such as paralisi cerebrale), or already have other allergies.

Other occupations can also put people at a higher risk of developing a latex allergy. These jobs include catering staff, food handlers, cleaners, and hairdressers. This is largely due to their regular use of rubber gloves.

If you think you might have a latex allergy, you should consult your GP.

Latex allergy can be diagnosed by an allergy specialist following tests and an examination of your medical history.

During this process, blood tests may be requested to help identify whether you are allergic.

Skin prick testing is often undertaken. This involves a small drop of liquid containing latex being injected under the skin surface, and the reaction being observed.

If you suspect a latex allergy, it's important to seek official confirmation of the diagnosis by visiting your doctor. In the interim, avoid latex. This may be difficult, especially if you work around latex products, so speaking with Occupational Health at your workplace could help ensure any products that you use daily are latex-free.

Dr Fox adds that you should try to limit or avoid contact with latex at home, whether that's in electronic devices, condoms, or other household objects.

"You should get to know and understand your symptoms and how to treat them. If you only have mild latex allergy symptoms, the use of oral antihistamines as soon as symptoms start may be all that is needed. However, you need to know and understand the signs of an acute anaphylactic reaction," she says.

"You may be given an adrenaline pen, called an EpiPen, and you need to know when and how to use it."

In social settings, wearing a medical alert bracelet or necklace can help to signal your allergy to others too.

Silicone is often used instead of latex in medical products since it is generally deemed safer. However, there have been reports of reactions to silicone as well.

People with a latex allergy who wear silicone contact lenses are known to be particularly susceptible to an allergic reaction, as well as those with silicone breast implants.

If you are unsure whether silicone is safe for you to use, then you should consult your allergy specialist.