A growing world population, food shortages and volatile weather: these dynamic factors are having an increasingly significant effect on agricultural production worldwide. More and more people need to be fed, but the available arable land per capita is decreasing across the globe. This is compounded by problems such as soil erosion, water shortages and extreme weather events, and poses major challenges for farmers in many parts of the world. Governments remain alert to the threat of food price volatility as unpredictable weather patterns have led to an increase in droughts, floods and hurricanes There are growing environmental concerns and pressure for governments to implement sustainability policies and reduce greenhouse emissions to counter the threat of climate change. Agriculture has been seen both as a cause and a victim of global warming over the past few years. This creates uncertainty in the industry and makes attracting investment to improve agricultural methods and efficiency more difficult.

11 Does aciclovir prevent the chances of developing herpes zoster (shingles) when given during primary infection?

12 How long does it take after vaccination to become immunized against chickenpox and therefore safe to work in infectious areas?

13 Is meticillin-resistant Staphylococcus aureus (MRSA) the only major hospital-acquired infection?

14 Do you have to have antibiotics to get Clostridium difficile infection?

15 Why do some patients with rheumatic fever later progress to chronic rheumatic heart disease?

16 What is the World Health Organization recommendation for the prophylaxis of rheumatic fever after a streptococcal throat infection?

17 Does rheumatic fever have an infectious or an immunological aetiology?

18 Why is migratory polyarthritis found in rheumatic heart disease?

19 Are penicillins still the drug of choice in streptococcal infections (particularly Strep. Pneumoniae)?

20 1. How long can the antistreptolysin-O (ASO) titre remain positive after a streptococcal infection? 2. What is the effect of a suitable antibiotic on the ASO titre, if any?