Malaria. We’ve all heard about it, many of us will have taken anti-malaria drugs for our travels, but do we really know what we’re dealing with?
At Red Square Medical, we do love a tropical disease, so we’ve put together this guide on all things malaria to help you and your crew stay safe, whether you’re travelling for work or fun!
Key Facts
- Malaria is caused by parasites that are transmitted via bites from infected female Anopheles mosquitoes (the pesky blighters).
- It can take just one bite to become infected. Bites mostly occur between dusk and dawn.
- There are 5 parasites that cause malaria in humans, with two of these (P. falciparum and P. vivax) posing a greater threat.
- It is life threatening.
- It is preventable and curable.
- Malaria can’t be passed from human to human.
- In 2020, it was estimated that there were 241 million cases of malaria worldwide.
- In 2020, there were 627,000 deaths from malaria.
- 95% of cases and 96% of deaths were in the World Health Organisation (WHO) African Region.
- Children under 5 years accounted for 80% of all deaths in the region.
- As recently as 2020, half the world’s population was at risk of malaria.
- Infants, children under 5, pregnant women, people with HIV/AIDS and those who are immunocompromised are at most risk.
- People with low immunity moving to areas with intense malaria transmission rates are also at risk - migrant workers, mobile populations and international travellers.
- Numbers of infections and deaths increased significantly from 2019 to 2020 though disruption from COVID-19 is partially responsible.
Symptoms
As with so many infections, the first signs of malaria are a fever, headache, ‘chills’, fatigue, vomiting and muscle aches, which can be mild and difficult to recognise as malaria. Other symptoms may include yellow skin or whites of the eyes, confusion, lethargy, nausea, loss of appetite.
Symptoms normally appear 7-18 days after the mosquito bite. But one of the parasites, P. falciparum, can progress to severe illness and death within just 24 hours if untreated. Symptoms of P. falciparum include behavioural changes, confusion, seizures, anaemia, respiratory failure, kidney failure, coma and shock.
In contrast, malaria can take weeks or even months to develop. In cases caused by the parasites P. vivax and P. ovale, relapses may occur weeks or months after being infected. Occasionally it can be years before symptoms appear.
Where is Malaria found?
Travellers going to malaria endemic areas in Africa, South America, and Asia are at high risk, with four African countries accounting for over half of all malaria deaths - Nigeria, Democratic Republic of the Congo, United Republic of Tanzania and Mozambique.
It is also found in the Dominican Republic and Haiti, parts of the Middle East and some Pacific islands.
People exposed to malaria in endemic areas who go back to their home country to visit friends and relatives are also at risk due to waning immunity. Although partial immunity is developed during years of exposure to the parasites, no one
becomes fully immune to malaria.
Since 2015, 9 countries have been certified by the WHO Director-General as malaria-free, meaning that they have achieved 3 years or more with no reported infections. These countries are the Maldives, Sri Lanka, Kyrgyzstan, Paraguay, Uzbekistan, Argentina, Algeria, China and El Salvador.
Prevention and treatment
For decades, there has been a global battle to combat malaria. Vital methods of control now include ‘vector controls’ and antimalarial drugs.
Vector control basically means interventions such as insecticide treated nets and indoor residual spraying, helping to reduce transmission and prevent infection.
Antimalarial drugs are taken prior to travel to a high risk area and should be used in conjunction with other malaria control activities.
Preventative medications are available for high risk individuals (e.g. infants and pregnant women) in high risk areas, and since October 2021 a vaccine has been available for children living in areas with high P. falciparum transmission. However all medicines should be used in conjunction with other malaria control activities.
Is it really a risk to mariners and superyacht crews?
Recently, UK P&I Club Members reported two cases of death and two more cases of serious illness, both resulting in a three month hospital admission, due to malaria.
So yes, our opinion is that it’s something we all need to be aware of and take the appropriate steps to ensure we protect ourselves to the best of our ability.
How to protect yourself…
- Check out the malaria risk for countries you’re due to visit well in advance. https://travelhealthpro.org.uk/countries
- Some antimalarial drugs must be taken for a few days or weeks prior to travel, and a few weeks after you return, so make sure you speak to your GP early enough.
- Make sure you have the correct medication for the geographical area.
- Make sure you have enough medication on board to last at the right dose for your whole trip, plus extra in case you are delayed.
- Wear long sleeved shirts and trousers in the evening when the mosquitoes are most active.
- Use 50% DEET based insect repellent on your skin. It smells bad though, so may repel more than just mosquitoes!
- Sleep under nets treated with insecticide, or use over doors, windows and ventilation holes.
- Use insecticide in cabins.
- Don’t sleep on deck.
It’s been well proven that early diagnosis and treatment reduces the risk of malaria and prevents deaths. So if you have travelled to a country with malaria and start to feel unwell, make sure you seek medical advice sooner rather than later.
It’s also worth remembering that malaria can reoccur, sometime years after the original infection.
Our Paramedic trainer, Rachel, has treated a patient who called for the ambulance himself but was unconscious by the time the crew arrived. He had a fever and was sweating profusely. He did recover sufficiently to answer questions and had felt unwell and getting worse for a few days. Symptoms were consistent with malaria but it was only when his wife arrived and mentioned the patient having had malaria previously that it was considered he could be suffering a relapse many years after his initial infection.
So if you’ve had malaria once, and you experience symptoms that feel ‘a bit like that time I had malaria’, be alert and get checked out asap.
Of course, if you need any further information, please get in touch, we’d be happy to help.