Showing posts with label Chile. Show all posts
Showing posts with label Chile. Show all posts

Sunday, 8 March 2026

Chile officially recognised as the first country in the Americas to have eliminated Leprosy.

Chile has become the first country in the Americas to be recognised to have officially eliminated Leprosy, according to a press release issued by the World Health Organization on 4 March 2024. Chile is only the second country globally to reach this goal, following Jordan in September 2024. The conformation also makes Chile the sixth country in the Americas to have eliminated at least one Neglected Tropical Disease, joining Brazil, Colombia, Ecuador, Guatemala, and Mexico.

Chilean flags. Mark Scott Johnson/Wikimedia Commons.

Leprosy was first recorded in Chile on Rapa Nui (Easter Island) in the late nineteenth century, with some subsequent cases reported on the mainland. The last reported case of a person becoming infected with the disease on Chilean territory occurred on Rapa Nui in 1993. However, the country has continued widespread monitoring for Leprosy, with 47 cases reported between 2012 and 2023, all of which were acquired outside of the country, and all of which were successfully treated.

Leprosy is caused by the Bacteria Mycobacterium leprae and Mycobacterium lepromatosis. It is essentially a skin disease, with the Bacteria infecting patches of skin, which can become dry and itchy, lose their pigmentation, suffer skin thickening, nerve damage, and local immune system failure, which can cause the patches vulnerable to secondary infections by other Bacteria, Fungi, and Viruses. It is these secondary infections which cause the ulceration and tissue loss associated with the disease, which can lead to shortening or loss of fingers and toes, or even facial features. The nerve damage associated with the disease can cause patients to fail to notice wounds, making them more vulnerable to infection.

Mycobacterium leprae heavy load (6+) in Ziehl-Neelsen stained slit skin smear microscopy at a magnification of 2000X. Ajay Kumar Chaurasiya/Wikimedia Commons.

Leprosy is thought to be spread by mucus droplets exposed by through the mouth or nose (which can enable it to spread among children rapidly) but not through most other forms of contact; it is not sexually transmitted, and patients with HIV do not appear to be any more vulnerable, although malnutrition may be a factor. Much of the Human population appear to be naturally immune to Leprosy, with vulnerability to the disease being genetic, and tending to run in families, which can be problematic, particularly in poorer communities where people are living in cramped conditions and have trouble accessing medicine. 

Leprosy is a zoonotic disease, with wild reserves of the Bacteria found in a number of Animal species, including Primates such as the Chimpanzee, the Sooty Mangabey, and the Cynomolgus Macaque. In Europe is thought to have been spread by Red Squirrels, which are known to be vulnerable to the disease, and which were extensively hunted for their fur in the Middle Ages. The disease is thought to have been introduced to the Americas by European settlers, but has become established in there in Armadillos, which can act as a wild vector, spreading Leprosy back to Humans.

The first effective treatment for Leprosy was developed by Alice Augusta Ball, a young researcher at the College of Hawai'i (now the University of Hawai'i), in 1915 (Ball is also noted to have been the first African American woman to achieve a masters degree in chemistry, the first African American woman hired as a chemistry instructor at the College of Hawai'i, and possibly the first African American woman to publish an article in a major scientific journal). Today it is typically treated with a combination of antibiotics such as rifampicin, dapsone, and clofazimine, with other antibiotics available if resistance to these is encountered. Such treatments can typically eliminate the disease completely, although the courses of treatment are long (6-12 months) and involves taking multiple pills each day, which can be problematic, particularly in younger children.

Alice Augusta Ball in 1915. University of Hawai'i/Wikimedia Commons.

Leprosy is still considered to be endemic to 132 countries, with around 200 000 new cases reported each year. The worst affected countries are Brazil, India, and Indonesia, each of which typically reports more than 10 000 new cases each year. Twelve other countries, Bangladesh, Democratic Republic of the Congo, Ethiopia, Madagascar, Mozambique, Myanmar, Nepal, Nigeria, Philippines, Somalia, Sri Lanka and Tanzania, typically report between 1000  and 10 000 new cases per year, while another 117 countries typically report between 1 and 1000 cases per year. The World Health Organization is currently working towards the global elimination of Leprosy in partnership with the Swiss drug company Novartis, which provides multi-drug therapy for the disease to patients anywhere in the world at no cost, under the Partnership to Eliminate Leprosy scheme.

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Monday, 16 February 2026

Magnitude 6.2 Earthquake in the Coquimbo Region of Chile.

The United States Geological Survey recorded a Magnitude 6.2 Earthquake at a depth of 36.9 km, roughly 32 km to the southwest of the city of Ovale in Limari Province, part of the Atacama Coquimbo of Chile, slightly before 10.35 am local time (slightly before 1.35 pm GMT) on Thursday 12 February 2026. There are no reports of any damage or injuries associated with this event, but people have reported feeling it as far away as Santiago, 400 km to the south.

The location of the 12 February 2026 Coquimbo Earthquake. USGS.

Chile is located on the west coast of South America, which is also the convergent margin between the Nazca and South American Plates. The Nazca Plate is being subducted beneath the South American Plate and is sinking beneath the South American Plate. This is not a smooth process, the rocks of the two plates continuously stick together then, as the pressure builds up, break apart again, causing Earthquakes. As the Nazca Plate sinks deeper it is partially melted by the heat of the Earth's interior. Some of the melted material then rises up through the overlying South American Plate as magma, fuelling the volcanoes of the Chilean Andes.

The subduction of the Nazca Plate beneath the South American Plate, and how it causes Earthquakes and volcanoes. Pacific Earthquake Engineering Research Center.

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Sunday, 8 June 2025

Magnitude 6.4 Earthquake in the Atacama Region of Chile

The United States Geological Survey recorded a Magnitude 6.4 Earthquake at a depth of 76.6 km, roughly 52 km to the southwest of the city of Diego de Almagro in ChaƱaral Province, in the Atacama Region of Chile, at about 1.15 pm local time (about 5.15 pm GMT) on Friday 6 June 2025. There are no reports of any damage or injuries associated with this event, but people have reported feeling it as far suth as Santiago, 900 km to the south.

The location of the 6 June 2025 Atacama Earthquake. USGS.

Chile is located on the west coast of South America, which is also the convergent margin between the Nazca and South American Plates. The Nazca Plate is being subducted beneath the South American Plate and is sinking beneath the South American Plate. This is not a smooth process, the rocks of the two plates continuously stick together then, as the pressure builds up, break apart again, causing Earthquakes. As the Nazca Plate sinks deeper it is partially melted by the heat of the Earth's interior. Some of the melted material then rises up through the overlying South American Plate as magma, fuelling the volcanoes of the Chilean Andes.

The subduction of the Nazca Plate beneath the South American Plate, and how it causes Earthquakes and volcanoes. Pacific Earthquake Engineering Research Center.

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Monday, 22 January 2024

Amasa parviseta: A new and highly invasive species of Ambrosia Beetle from Australia, South America, and Europe.

Ambrosia Beetles are one of the most diverse groups of Bark Beetles, with over 1300 described species in 43 genera, found throughout the world's tropical and temperate regions. The biology of these Beetles enables them to colonise new areas rapidly, with many species considered to be highly invasive pests, causing significant economic and ecological damage in forests, orchards, nurseries as well as urban and suburban gardens. This is because the Beetles bore into the wood of trees and cultivate gardens of Fungus, feeding on an ambrosia produced by the Fungus rather than the wood of the tree. This means that, unlike most wood-boring Insects, they are not tied to a single species of tree, although some species and genera are restricted to a single family of hosts. The reproductive cycle of the Beetles also favours dispersal, with diploid females mating with haploid males within their birth tree before dispersing to new trees to lay eggs. 

The taxonomy of Ambrosia Beetles can be challenging, due to the small size of these Insects, and their wood boring lifestyle, which means both that they are out of sight and that they are not under any evolutionary pressure to become visually distinct. Members of the genus Amasa can be distinguished from other genera by their truncated abdomens and elytra (wing cases) which have a distinct declivity (downward fold) at the rear. However, telling species apart can be difficult, particularly as most species are known only from a single, or very small number of, specimen(s) held in widely distributed collections. There are currently 47 species of Amasa, from across tropical Asia and Oceania; two species from Madagascar have been assigned to the species, but this is probably erroneous. 

In 2011 a species of Amasa found infesting a Eucalyptus grandis plantation in SĆ£o Paulo State,  Brazil, was provisionally identified as Amasa truncata, a widespread invasive species, although further investigation led to the conclusion that this was a morphologically similar, but unknown, species. This new Beetle was reported from Minas Gerais State in Brazil as well as in neighbouring Uruguay in 2015. In 2016 it was reported from ValparaĆ­so in Chile, and by 2018 it had reached Argentina.

Similar specimens found in CĆ”diz, Spain, in 2009, were initially identified as Amasa  resecta, but again were later shown not to belong to this species. In 2018 the same species was found in Antibes,  France, and in 2019 in Lisbon,  Portugal. A genetic analysis of specimens collected in France found them to be 100% identical to members of an unknown species from New South Wales.

In a paper published in the journal Zootaxa on 12 January 2024, MiloÅ” Knížek of the Forest Protection Service at the Forestry and Game Management Research Institute, and Sarah Smith of the Department of Entomology at Michigan State University, formally describe the unknown Amasa species based upon specimens from Australia, South America, and Europe.

The new species is named Amasa parviseta, where 'parviseta' means 'small hairs' as the hairs on the elytral  declivity is almost hairless, with only a few microscopic hairs. The new species is described on the basis of specimens from New South Wales, the Australian Capital Territory, and Queensland in Australia, Alpes-Maritimes Department in France, Galicia in Spain, SĆ£o Paulo State in Brazil, and Tacuarembó Department in Uraguay. It is also thought to be present in Corsica, Portugal, Minas Gerais, Argentina, and Chile.

Amasa parviseta paratype female from Ponteverda Spain (MiloÅ” Knížek collection) (1) habitus dorsal view; (2) habitus lateral view; (3) elytral declivity part; (4) elytral declivital face; (5) lateral detail of elytral declivity with microscopic hair-like setae visible on the lateral edge of the declivity and on the apices of tubercles on the declivital face. AntonĆ­n Knížek in Knížek & Smith (2024).

Females of Amasa parviseta are 2.38–3.00 mm long and light brown in colour, with slightly darker elytra. Males are unknown. The species was found on Eucalyptus trees and in Eucalyptus leaf litter; some were captured in traps in mixed Eucalyptus and Pine woodland. 

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Wednesday, 9 August 2023

Direct archaeological evidence for the torture and mutilation of Mapuche prisoners during the sixteenth century 'War of Arauco'.

The conflict between the conquering Spanish and the indigenous peoples of the Americas has retained a reputation for particular brutality, even against the wider context of European conquests of non-European peoples. In Chile the conflict between the Spanish and the indigenous Mapuche people lasted for almost three centuries, from 1536 to 1810, a period known as the 'War of Arauco', although this is somewhat of a misnomer, with the 'war' comprising several periods of intense conflict, interspersed with periods of peace. The Mapuche people were able to resist conquest by the Spanish for so long due to their willingness to adopt the tools of their enemies, including firearms, cavalry, and military tactics.

In 1550 the Spanish commander Pedro de Valdivia reported execution and mutilating Mapuche prisoners by cutting off of hands, feet, noses, ears, and breasts, which was a common practice for Spanish leaders of the time (de Valdivia was defeated in battle, captures and executed by the Mapuche three years later). The tactics used by the Spanish in the Americas typically involved capturing political and religious leaders, forcing surrender through torture, and then publicly massacring important members of the community, usually in brutal ways.

Although well documented, little physical evidence for this conflict exists today, due to the humid climate and regular heavy rains of south-central Chile, which are not favourable for the preservation of archaeological remains. Furthermore, many archaeological collections made in the first half of the twentieth century have either been lost or kept so poorly that it is hard to assess their original context. 

In a paper published in the journal Open Archaeology on 19 July 2023, Juan Francisco Reyes SĆ”nchez of the Equipo Chileno de AntropologĆ­a Forense, and Alberto Enrique PĆ©rez of the Facultad de Ciencias Sociales y Humanidades at the Universidad Autónoma de Chile, present a study of two burials at the Newen Antug archaeological site in NeuquĆ©n Province, Argentina, which show evidence of violence likely to have been linked to the conflict with the Spanish. 

The Newen Antug archaeological site lies on the Argentinian side of the Valdivia River Basin, which forms the border between Chile and Argentina, within the LĆ”car and NonthuĆ© Lake System. The site was first occupied about 880 years ago, and has yielded, amongst other things, the earliest known canoe burial in South America. 

Newen Antug site, on the shores of LĆ”car Lake, which is part of a binational archaeological site in the Valdivia river basin. The inset shows the stash of Florentine stirrup location and small Spanish fort location. Reyes SĆ”nchez & PĆ©rez (2023).

It this study Reyes SĆ”nchez and PĆ©rez examine two individuals, one female and one male, which date from the second occupation of the site, Both were laid on their right sides with their legs flexed and their arms parallel to their bodies. Their heads (in both cases) have rotated paraventral on their axial axes as a result of the loss of thoracic volume and the resistance of the intervertebral tissues due to compaction of the grave. 

The grave of the female individual has an east-west axis with the body laid facing to the south. The male individual is laid in a grave with a northwest-southeast axis, facing to the northeast. Three clay pots were placed within the grave of the female, decorated in the local Valdivia Red on White Bichrome tradition, and arranged around her head.

Plan of the excavation of the mortuary features of Individuals 1♀ and 2♂ of the Newen Antug site. Reyes SĆ”nchez & PĆ©rez (2023).

The female individual is estimated to have been 150 cm tall, and based upon morphology of the cranial and postcranial skeleton and examination of tooth wear, the to have been over 52 years old. The male is estimated to have been 168 cm high and 30-40 years old. Radiocarbon dating of a piece of charcoal from the grave of the female individual gave a date of 540 years before the present, consistent with the mid sixteenth century, when the first contact (and conflict) between the Spanish and the Mapuche occurred.

The female is missing both hands and the lower part of the left arm, and has as grave goods the calcaneus and astragalus of a Horse (another sign of contact with the Spanish), and a sharpened partial metatarsus of a South Andean Deer, possibly as a replacement for the missing limb portions. She also has a curved transverse fracture on the left ulna, with a regular border, stepped and with crushed edges, and associated with a longitudinal fracture, and an s an incomplete oblique fracture of the medial portion of the humeral diaphysis. The damage to the right left radius is consistent with a spiral fracture, although the preservation of this bone is not good enough to be certain.

The male also lacks the left hand and the lower part of the left forearm, with a spiral fracture on the e medial diaphysis of the left radius, with the broken edge of both the radius and ulna showing signs of crushing and scaling. Another incomplete fracture is present on the right ulna.

Diagram of skeleton, anterior view. Individual 1♀ and Individual 2♂, respectively. The locations of the lesions are shown in red. Reyes SĆ”nchez & PĆ©rez (2023).

The break to the right ulna of the male skeleton is consistent with a 'parry fracture', i.e. a would suffered while defending against a blow, while the left fibula shows signs of a blunt force injury, probably the result of another blow.

The injury to the left humerus of the female skeleton is consistent with a blunt force injury inflicted while the limb was flexed and rotated, while held in position at the upper end. Such injuries elsewhere have been interpreted as signs of torture, i.e. injuries deliberately inflicted on an individual while they are restrained. 

Both individuals have lost the lower part of their left arms, and both show signs of blunt force trauma to the remaining portion of the bones of the lower arm. This is unusual, and blunt-force injuries do not usually remove portions of limbs. While the injuries produced by sharp blades and blunt objects are generally quite different, prior observations have suggested that heavy axe blows can sometimes produce a hybrid injury, both crudhing part of a limb and hacking off the portion below the site of the blow. This appears to be entirely consistent with the injuries to the limbs of both individuals. 

The injuries to these individuals appear quite different to those seen in individuals injured in conflict settings; instead they show injuries consistent with having been brutalised while being tied down or otherwise restrained. 

Prior to contact with the Spanish dismemberment seen in skeletons was consistent with one of two causes; injury in battle, or post-mortem dismemberment for ritual purposes. Notably, in late pre-contact Andean societies, port-mortem dismemberment of bodies to make war trophies was a common practice, as are pre-death blunt force trauma injuries, particularly to the head area, and cuts on the bones of the neck from where the throat was cut.

The arrival of the Spanish in the Americas brought new technologies and practices of injuries to the area. In southeastern North America, the Gulf of Florida, and Peru, this has been shown to manifest in the widespread execution-style killing of both adults and children, pre-death injuries including pre-death blunt force injuries, lessons caused by blunt-sharp blows, and injuries caused by firearms.

Documents made by the Spanish themselves during this period record captured leaders being tied to tree-trunks and tortured by mutilation, who then had their wounds cauterized before being set free, with the intention that they would live long enough to return to their people and display the traumatic injuries, spreading general alarm. This practice appears to have been carried out on a massive scale, with producing large piles of severed limbs and other bodyparts. One notable form of torment was to disarticulate the hand from the forearm, leaving it dangling by a tendon. Notably, such a practice can be achieved without leaving and cuts on the bones, as can other forms of torture known to have been used during the Spanish invasion, which could therefore also potentially have been used on the Newen Antug individuals.

Engravings by ThĆ©odore de Bry showing mutilations of hands and noses (bottom) and torture (top) applied by Spanish soldiers to indigenous people in America. Reyes SĆ”nchez & PĆ©rez (2023).

In 1552 and 1553, Spanish troops under r Francisco de Villagra are known to have passed through the NeuquĆ©n Andean lake district, engaging in a number of conflicts with the local population, which resulted in heavy casualties on both sides. 

The two individuals buried at Newen Antug appear to have been members of the community held in high regard, who were buried with special care with symbolic artefacts emphasizing their leadership roles. 

Reyes SĆ”nchez and PĆ©rez interpret the injuries suffered by these two injuries as indications that they were taken hostage by the Spanish, and subjected to torture and mutilation whilst restrained, particularly to the left hands and forearms. Both left arms appear to have been struck with sufficient force to split the arm in two, with the injury most likely caused by a blunt axe impacting at an angle of about 45°. These injuries almost certainly lead to the deaths of their victims, but probably not straight away, something consistent with Spanish records of prisoners being tortured and mutilated before being released to spread fear in their communities.

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