ABSTRACT
The trend for population to grow in urban areas at the expense of rural areas has been witnessed since industrialization began in Europe in the eighteenth century, but has become particularly prominent in the global South over recent decades. This has had profound implications for the spread of disease in two dimensions:
1 Overcrowding in LDC cities has led to many people living in squalor, providing the conditions for diseases associated with poor sanitation to emerge and for other diseases to be more readily transmitted among a large population. Examples of this include dysentery and cholera, chiefly spread by unsanitary food and water.
