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Additional Information to: Developing countries general information sheet.
see also Australian
consular advice: www.smartraveller.gov.au/zw-cgi/view/Advice/
DISEASES - AFRICA
Heat and humidity
Excessive heat and humidity, or overexertion in these conditions, may lead to
exhaustion from loss of water and salts and to severe heat-stroke requiring emergency
medical attention. Tea and drinks rich in mineral salts (fruit and vegetable juices, clear
soups, etc.) are recommended in cases of exhaustion Unless contraindicated, the addition
of a little table salt to food or drinks helps to prevent heat exhaustion, especially
during the period of acclimatisation.
Children and overweight people often suffer from skin irritation (prickly heat). Fungal
skin infections such as tinea pedis (athlete's foot) are often exacerbated by heat and
humidity. Daily showering, loose cotton clothing and the application of talcum powder to
sensitive skin areas will help to reduce these conditions.
Eye, ear, and intestinal infections may be contracted from polluted water. In the
tropics, watercourses, canals, lakes, etc. may be infested with larvae that can penetrate
the skin and cause schistosomiasis (bilharziasis). Bathing and washing in waters likely to
be infested with the snail host of this parasite or contaminated with human and animal
excreta should be avoided. Only swimming pools containing chlorinated water may be
considered safe for bathing.
"Swimmers Itch" or cercarial dermatitis due to a wide range of trematodes (water
parasites) may be acquired in freshwater bodies of both temperate and tropical zones.
These cercariae penetrate the skin and die, causing a localised or extended skin
allergic reaction. Treatment is symptomatic with eczema preparations.
In areas of known risk, footwear should be worn on land as a protection against worm
lavae that can burrow through even the tough skin of the foot (ankylostomiasis,
strongyloidiasis, certain mycetomas, and tungiasis.) - also common Cutaneous lava
Schistosomiasis ( bilharziasis )
This is a microscopic skin penetrating parasite disease
Travellers at risk from this infection are those who bathe in streams, rivers, or lakes,
or who indulge in water sports in fresh-water areas. Some areas are especially risky; the
Nile valley, Lake Victoria, the Tigris and Euphrates river systems, and artificial lakes
such as Lake Kariba in Zimbabwe and Lake Volta in Ghana. There is a sign at Lake Malawi
that proclaims that it is safe to swim. It definitely is not!
Since the larvae die quickly on removal from water and cannot survive drying, quick drying
of exposed skin and clothing does offer some protection. Swimming for short periods in
flowing rather than still waters, avoiding the early and late parts of the day, and
vigorously rubbing oneself down with a towel immediately after leaving the water may
reduce the risk. When schistosomiasis occurs in one or
more members of a travelling party, the proportion of those in the party infected is high
(between 30% and 60%).
Insect Spread Diseases
Protection against insect bites is important. Many diseases (viruses, parasites and
bacteria) are spread by the bites of ticks, sandflies and mosquitoes, which are abundant
throughout the region.
Filariasis ( a blood parasite) is confined to the tropics and spread from
person to person by insect bites. Travellers have little to fear from this disease, as
practically always, the infections, if acquired, are only light and not serious.
Loiasis can be prevented by taking diethylcarbamazine 200 mg daily for three
consecutive days each month whilst in heavily infected areas, such as parts of Cameroon.
Diethylcarbamazine 300 mg once a week was effective in preventing this infection
is endemic in Cameroon, Central African Republic, Congo, Equatorial Guinea, Gabon, Ghana,
Nigeria, and Zaire (NEJM 1988; 319:752-6).
Sleeping Sickness A rare disease in travellers this parasite
(trypanosomiasis) is spread by the bite of the tsetse fly and may be a concern to those
going on wild life safaris in East Africa, travellers to remote rural areas and those who
work with wild animals. Tsetse flies are only active during the day and are attracted by
brightly coloured clothing especially blue. Wearing wrist to ankle length clothing,
mosquito netting, and knock down insect sprays are recommended. Insect repellents cannot
be relied upon but are helpful. Travellers who are likely to spend a prolonged period in
an endemic area should seek expert local opinion regarding drug prevention.
Food and Water- borne Diseases
Many forms of worm, parasite and dysentery diseases are highly endemic and advice on
selection of food and drinking of water heeded.
Medical Treatment whilst away
Disposable needles, syringes and gloves are available in kits for the traveller. Those
contemplating a long stay particularly in remote areas should take these. Kits are also
available that contain local anaesthetic, suture material and temporary fillings as well
as water purification tablets (puritabs) or filter devices (travel well). TMVC
and many chemists provide these.
Current Yellow Fever Infected Areas see www.cdc.gov/travel/outbreaks.htm
Examination after travel: It is advisable (if not essential) to visit your
local doctor promptly if you
- suffer from a chronic disease, such as cardiovascular disease, diabetes
mellitus, chronic respiratory disease;
- experience illness in the weeks following their return home, particularly
if fever, persistent diarrhoea, vomiting, jaundice, urinary disorders, skin
disease or genital infection occurs;
- consider that you may have been exposed to a serious infectious disease while
- have spent more than 3 months in a developing country.
Source: WHO - http://whqlibdoc.who.int/publications/2005/9241580364_chap1.pdf (page
Information mostly taken from: "International
Travel and Health" (WHO year book -
Australian Immunisation Handbook, 8th Edition - 9/2003 - Part1 - Part 2 & Part 3 (large pdf
Centre for Disease Control, USA - www.cdc.gov/travel Travel Health Seminar Oct 96, June 97,Feb 98, March 99, May 2000, August 2002 &
March 2005 - Victorian Medical Postgraduate Foundation.
Manual of Travel Medicine,
Melbourne, Oct 2004.
Updated 06/09/2006. Additional references & disclaimer.