Bali: Malarial prophylaxis is not recommended (including trips to hotel resorts in the interior.) However rare cases of non life-threatening malaria (vivax) have occurred in tourists.  Japanese encephalitis vaccine for long term travellers;   Also advise anti-mosquito measures  (will reduce chance of contracting Dengue)

Lombok and surrounding islands: Malarial prophylaxis is recommended.
(If stay is for a few days and the traveller will be back in Australia within 7 days > nil but take stringent anti mosquito measures. Also travellers need warned to seek urgent assessment for a febrile illness in the weeks following return).

For the rest of Indonesia, Malarone, doxycycline or mefloquine recommended by VIDS.

China: Malarial risk - No malarial prophylaxis is needed for common tourist destinations. Mefloquine, doxycycline or Malarone for travel to Yunnan & Hainun provinces.
Schistosomiasis risk in Central Yangtze river basin. Hepatitis E risk in Xinjiang province.

Egypt: Nil for malaria. Meningococcal vaccine if stay > 10 to 14 days. Schistosomiasis prevalent in fresh water.

India: malarial prophylaxis with malarone, doxycycline or mefloquine for cities of Delhi, Calcutta, Madras and Mumbai as well as in rural areas. Rabies is prevalent and HIV increasing. Meningococcal vaccine > 2 weeks to northern India especially new Delhi..

Nepal: No malarial risk if going only to Kathmandu & trekking in the Himalayas. Malarone,  Mefloquine or Doxycycline for lowlands near Indian border. (Chitwan national park and the terai plains districts of Bara, Dhanukha, Kapilvastu, Mahotari, Parsa, Rautahat, Rupandehi, and Sarlahi.). Meningococcal vaccine for all. Japanese Encephalitis prevalent in lowlands from July to December. High risk of travellers diarrhoea and Hepatitis E  

Thailand:  Malaria - Malarone or Doxycycline for hilly forested border regions (Myanmar in north-west, Cambodia in the east and rural peninsular areas. Minimal malarial risk and no prophylaxis required for Bangkok, Chiang Mai (city) & southern coastal resorts (Phuket, Pattaya, Koh Samui, Koh Pee Pee, Koh Samet). Rabies and Dengue prevalent - ?Japanese encephalitis vaccine if > 2 months. Also sexually transmitted disease including HIV need mention.

Vietnam: Malarial prophylaxis with malarone, doxycycline or mefloquine for highlands and forested rural areas to the west. No risk in major cities, Red River Delta, coastal plains north of Nha Trang. The risk is very low in most tourist trips (<1%/person/year).  Japanese encephalitis risk in rural areas and in Hanoi during May to October. Dengue and rabies prevalent.

Papua New Guinea: Malarone, doxycycline or mefloquine for all. - except a short stay (a few days) in Port Moresby and travel to highland areas only >1800 metres. High risk of typhoid and consider Japanese Encephalitis vaccine for long term stayers - more than 1 month.

Solomon Islands: High risk of malaria throughout all the islands (peak Jan - March)

Vanuatu: Malarone, doxycycline or mefloquine for all. low risk for port vila. Futuna island is malaria free

Overland trip (4 mths ): Johanasberg to Nairobi - Rabies & Meningococcal vaccine. 3 treatment packs for diarrhoea.
Suggest refer to special travel clinic.

South America: No malarial risk for tourist areas of Cuzco, Iguassu Falls, Lake Titicara, La Paz Lima, Machu Picchu, & Quito. Yellow Fever not required for costal Peru or Costal Brazil. Schistosomiasis, Chagas disease and Cutaneous Leishmaniasis of concern in certain areas.