Prevalence of rabies

Historically, rabies was highly endemic in China, with few/inconsistent attempts to control transmission due to the lack of healthcare infrastructure. More than 5,200 deaths were reported annually during the period 1987 - 1989.[5] Infection is seasonal, with more cases reported during the spring and winter, with dogs being the most common animal vector.[6] The highest number of recorded cases was recorded in 1981, with 7037 human infections.[7] It was only until the 1990s did death rates decrease, as eradication efforts started being implemented on a nationwide level. The incidence of rabies decreased to fewer than 2000 cases per annum by 2011.[5] Despite this progress, rabies is still the third most common cause of death amongst category A and B infectious diseases, following HIV/AIDS and tuberculosis.

Chinese law requires all diagnosed rabies cases to be recorded in the National Notifiable Disease Surveillance System (NNDSS) within 24 hours of diagnosis. Additionally, a questionnaire is used to interview patients and family members, in order to collect demographic information, as well as the means of exposure.[6]

Due to China's open organ transplant policy, an additional vector for the transmission of rabies is via donated organs. There has been 1 reported case of rabies transmission through organ donation in 2015, where a previously healthy 2-year-old patient was checked in to a hospital with unspecified symptoms. Rabies virus antibody tests were performed on serum samples and yielded negative results, which allowed the body to be used for donations despite suspicions from the clinical staff. The donor's kidneys and liver were transplanted to two other patients, who eventually died due to the rabies virus.[8]

In 2006 China introduced the "one-dog policy" in Beijing to control the problem.[9]

The island of Bali in Indonesia has been undergoing a severe outbreak of canine rabies since 2008, that has also killed about 78 humans as of late September 2010.[10] Unlike predominantly Muslim parts of Indonesia, in Bali many dogs are kept as pets and strays are tolerated in residential areas.[11] Efforts are under way to vaccinate pets and strays, as well as selective culling of some strays,[10] to control the outbreak. As Bali is a popular tourist destination, visitors are advised to consider rabies vaccinations before going there, if they will be touching animals.[12]

Since 1948, 29 people have been reported dead from rabies in Israel. The last death was in 2003, when a 58-year-old Bedouin woman was bitten by a cat and became infected. She was not inoculated and later died.[13]

Rabies is not endemic to Israel, but is imported from neighbouring countries. The areas of highest prevalence are along the northern region, which are close to Lebanon and Syria. Since the early 2000s, The Ministry of Agriculture and Israel Nature and National Parks Protection Authority (ILA) have dropped oral vaccines from planes in open and agricultural areas. The vaccine comes in the form of 3 by 3 cm. dumplings, made with an ingredient preferred by wild animals, and which contain a transgenic rabies virus. Cases of animal rabies dropped from 58 in 2009 to 29 in 2016.[14]

Rabies existed in Japan with a particular spike in the mid-1920s, but a dog vaccination campaign and increased stray dog control reduced cases.[15] The Rabies Control Act was enacted in 1950, and[16] the last human and animal cases were reported in 1954 and 1957,[17] and Japan is believed to have been rabies-free since 1957.[18]

There have been three imported cases since then, a college student who died in 1970, and two elderly men who had travelled to the Philippines and been bitten there by rabid dogs, and then died after returning to Japan.[15][19][20]

In South Africa, about a dozen cases of human rabies are confirmed every year[22] and it is particularly widespread in the north-eastern regions of the Eastern Cape, the eastern and south-eastern areas of Mpumalanga, northern Limpopo and KwaZulu-Natal.[23] Dogs are the main vector (especially in the east of the country) for the disease but also wildlife, including the bat-eared fox, yellow mongoose and black-backed jackal.[24] The death rate of 13 per annum over the decade 2001–2010 [25] is a rate of approximately 0.26 per million population. This is approximately 30 times the rate in the United States but 1/90th of the African average. The number of cases per province over the last decade are as follows:[26]

The United States as with other developed countries have seen a dramatic decrease in the number of human infections and deaths due to the rabies virus. According to the Centers for Disease Control and Prevention (CDC) the stark reduction in the number of rabies cases is attributable to the elimination of canine rabies through vaccination, the vaccination of wildlife, education about the virus, and timely administration of post exposure prophylaxis. Currently, in the U.S. only one to three cases of rabies are reported annually. Since 2008 there have been 23 cases of human rabies infection, eight of which were due to exposures outside of the U.S.[27] Human exposures to the virus is dependent on the prevalence of the virus in animals, thus investigations into the incidence and distribution of animal populations is vital. A breakdown of the results obtained from animal surveillance in the U.S. for 2015 revealed that wild animals accounted for 92.4% and domestic animals accounted for 7.6% of all reported cases.[28] In wild animals, bats were the most frequently reported rabid species (30.9% of cases during 2015), followed by raccoons (29.4%), skunks (24.8%), and foxes (5.9%).[29]

Rabies was once rare in the United States outside the Southern states, but raccoons in the mid-Atlantic and northeast United States have been suffering from a rabies epidemic since the 1970s, that is now moving westwards into Ohio.[30] Most westward expansion has been prevented via the action of Oral Rabies Vaccination (ORV) programs.[31]

Cases of animal rabies in the United States in 2001

The particular variant of the virus has been identified in the southeastern United States raccoon population since the 1950s, and is believed to have traveled to the northeast as the result of infected raccoons being among those caught and transported from the southeast to the northeast by human hunters attempting to replenish the declining northeast raccoon population.[32] As a result, urban residents of these areas have become more wary of the large but normally unseen urban raccoon population. Whether as a result of increased vigilance or only the common human avoidance reaction to any other animal not normally seen, such as a raccoon, there has only been one documented human rabies case as a result of this variant.[33][34] This does not include, however, the greatly increasing rate of prophylactic rabies treatments in cases of possible exposure, which numbered fewer than one hundred humans annually in the state of New York before 1990, for instance, but rose to approximately ten thousand annually between 1990 and 1995. At approximately $1,500 per course of treatment, this represents a considerable public health expenditure. Raccoons do constitute approximately 50% of the approximately eight thousand documented non-human rabies cases in the United States.[35] Domestic animals constitute only 8% of rabies cases, but are increasing at a rapid rate.[35]

A rabid dog, with saliva dripping out of the mouth

In the midwestern United States, skunks are the primary carriers of rabies, composing 134 of the 237 documented non-human cases in 1996. The most widely distributed reservoir of rabies in the United States, however, and the source of most human cases in the U.S., are bats. Nineteen of the twenty-two human rabies cases documented in the United States between 1980 and 1997 have been identified genetically as bat rabies. In many cases, victims are not even aware of having been bitten by a bat, assuming that a small puncture wound found after the fact was the bite of an insect or spider; in some cases, no wound at all can be found, leading to the hypothesis that in some cases the virus can be contracted via inhaling airborne aerosols from the vicinity of bats. For instance, the Centers for Disease Control and Prevention (CDC) warned on May 9, 1997, that a woman who died in October 1996 in Cumberland County, Kentucky and a man who died in December 1996 in Missoula County, Montana were both infected with a rabies strain found in silver-haired bats; although bats were found living in the chimney of the woman's home and near the man's workplace, neither victim could remember having had any contact with them.[36] Similar reports among spelunkers led to experimental demonstration in animals.[37] This inability to recognize a potential infection, in contrast to a bite from a dog or raccoon, leads to a lack of proper prophylactic treatment, and is the cause of the high mortality rate for bat bites.

On September 7, 2007, rabies expert Dr. Charles Rupprecht of Atlanta-based U.S. Centers for Disease Control and Prevention said that canine rabies had disappeared from the United States. Rupprecht emphasized that the disappearance of the canine-specific strain of rabies virus in the US does not eliminate the need for dog rabies vaccination as dogs can still become infected from exposure to wildlife.[38]

The primary terrestrial reservoirs for the Southwest states are skunks and foxes, with bats being identified as another important species for virus persistence in the environment. In Colorado the growing population pressures indicated by the increase in the number of residents by 9.2% between 2010 and 2016[39] has led to an elevated risk of rabies to the public. Additionally, according to Colorado Parks and Wildlife, reported cases, as well as the geographical distribution, in skunks, raccoons, and bats have increased; thereby further enhancing the likelihood of exposure. Together these increased risk factors have been documented in the state by the Colorado Department of Public Health and Environment, which reported 141 positive animals; 95 of these reported animal cases were suspected to have exposed 180 domestic pets, 193 livestock animals, and 59 people.[40] In New Mexico the same trend of increased prevalence in wildlife has been observed with a reported 57% increase in the number of rabid bats.[41] As of 2017, there have been 11 confirmed cases of rabies in New Mexico: 5 bats, 2 skunks, 2 bobcats, and 2 foxes.[42] Conversely to these two states, Arizona in 2015 saw a drop in the number of confirmed rabies cases with a 21.3% decrease in reported skunk and fox rabies virus variants.[41] Furthermore, during that same time frame in Arizona 53.3% of all reported positive rabies cases were bats and 40% were identified as skunks.[43] Similarly, in 2015, Utah reported 22 positive cases of rabid bats.[44][41] For the year of 2016 Utah had identified 20 total positive cases of rabies, all of which pertained to only bat species.[45]

The first case of rabies since 1978 was confirmed in the city of Toledo, Central Spain, on 5 June 2013. The dog had been imported from Morocco. No human fatalities have been reported, although adults and children were reported to have been bitten by the animal.[48]

Nine deaths from rabies were reported in Germany between 1981 and 2005. Two were caused by animal bites within Germany (one fox, one dog), and four were acquired abroad. In the remaining three cases, the source was a transplant from a donor who had died of rabies.[49] On 28 September 2008, the World Organisation for Animal Health declared Germany as free of rabies.[50]

In 1897 the Disease of Animals Act included provisions to prevent the spread of rabies throughout Ireland. There have been no indigenous cases reported since 1903. In 2009, four people in Dublin received rabies vaccination therapy after being bitten by an imported kitten, although subsequent examination of the kitten yielded a negative result for rabies.[51][52]

The UK was declared rabies free in 1902 but there were further outbreaks after 1918 when servicemen returning from war smuggled rabid dogs back to Britain. The disease was subsequently eradicated and Britain was declared rabies-free in 1922 after the introduction of compulsory quarantine for dogs.[49][53]

Since 1902, there have been 26 deaths in the UK from rabies (excluding the European bat lyssavirus 2 case discussed below).[49][54] A case in 1902 occurred shortly before the eradication of rabies from the UK, and no details were recorded for a case in 1919.[49] All other cases of rabies caused by rabies virus acquired the infection while abroad. Sixteen cases (62%) involved infections acquired in India, Pakistan or Bangladesh.[49]

Since 2000, four deaths from rabies have occurred; none of these cases had received any post-exposure prophylactic treatment. In 2001, there were two deaths from infections acquired in Nigeria and the Philippines. One death occurred in 2005 from an infection acquired by a dog bite in Goa (western India).[49][55] A woman died on 6 January 2009 in Belfast, Northern Ireland. She is believed to have been infected in South Africa, probably from being scratched by a dog.[56][57][58][59] Prior to this, the last reported human case of the disease in Northern Ireland was in 1938.[58][59] The most recent case was a woman who died on 28 May 2012 in London after being bitten by a dog in South Asia.[60]

A rabies-like lyssavirus, called European bat lyssavirus 2, was identified in bats in 2003.[55] In 2002, there was a fatal case in a bat handler involving infection with European bat lyssavirus 2; infection was probably acquired from a bite from a bat in Scotland.[49][55]

The Netherlands has been designated rabies-free since 1923, Belgium since 2008. Isolated cases of rabies involving illegally smuggled pets from Africa, as well as infected animals crossing the German and French borders, do occur.[61]

The death of a woman on 6 May 2019 from the rabies virus was reported to be the first in Norway for almost 200 years. She contracted the virus while on holiday with friends in the Philippines, and after being bitten by a stray puppy they had rescued.[62]

Australia is free of rabies. There have been two confirmed human deaths from the disease, in 1987 and 1990. Both were contracted overseas. However the closely related Australian Bat Lyssavirus (ABLV) has caused three deaths since its discovery in 1996, the most recent of these was in 2013 when an 8 year old Queensland boy was scratched on the wrist by an infected bat, developing rabies and dying 2 months afterwards.[63] There is also a report of an 1867 case.[64] There has been professional concern that the arrival of rabies in Australia is likely, given its wide spread presence in Australia's neighbour, Indonesia.[65]