Final answer:
The 2nd International Sanitary Conference in 1859 likely covered topics similar to those of subsequent conferences, such as disease prevention and quarantine measures. While the number of attendees isn't specified, the focus was on combating infectious diseases like cholera.
Step-by-step explanation:
The 2nd International Sanitary Conference that was held in 1859 in Paris was an important historical event in the field of public health, although the exact number of countries and doctors present is not detailed in the provided information. Topics at subsequent conferences, such as the third one held in Constantinople in 1866, focused on diseases like cholera, with discussions spanning the origins and spread of plague and other infectious diseases. The 1859 conference likely covered similar topics, including quarantine measures, disease prevention, and public health policies. During the nineteenth century, governments and reformers made several attempts to prevent the spread of disease in industrial cities. This led to advances in urban planning, including the establishment of modern sewer systems, and public health legislation like Britain's Public Health Act of 1848 and the Alkali Act of 1863.