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Pneumonia is a significant cause of morbidity and mortality and can affect all age groups although it is the very young and the very old who are most at risk. Pneumonia can be caused by many different organisms and can present as a primary condition or as a complication of other diseases or acute health problems. This article will give an overview of the disease, its symptoms and treatment and will focus primarily on community-acquired pneumonia. Two further articles will look at specific causative organisms, i.e. Streptococcus Pneumoniae and influenza, as well as the preventive strategies for these.

Japanese encephalitis (JE) is the most commonly diagnosed viral encephalitis in Asia. JE is caused by a virus called JE virus (JEV), a member of the genus Flavivirus, family Flaviviridae, and is transmitted by Culex mosquitoes. Neutralising antibody to JEV protects against JE, and can be induced by vaccination. JE is a potential threat to travellers to endemic areas, which are most of South and Southeast Asia and some Pacific Islands. The risk of JE can be expected to increase with increasing mosquito exposure and time spent in regions and seasons of active transmission. JE is very rare in travellers, but mortality is high, around 1 in 3, and there is a high rate of lasting neurological damage. JE can therefore be a profoundly life changing event for a traveller. Travellers and their healthcare providers need to balance the low risk of disease against the very high severity of disease if it does occur. In order to make an informed decision, the severity of JE disease should be carefully explained to travellers to Asia.

Overseas travel, especially long-haul, can have risks that are not only associated with infection but also the mode of transport, climate, lifestyle and conditions at the destination. These risks may be magnified if the individual has a pre-existing medical condition.

In the first article of this three-part series, Carolyn Driver provides an explanation of how the lung infection, pneumonia, can be caused and how this affects the respiratory system in order to inform practice in care homes