First vaccination
Anthrax posed a major economic challenge in France and elsewhere during the 19th century. Horses, cattle, and sheep were particularly vulnerable, and national funds were set aside to investigate the production of a vaccine. French scientist Louis Pasteur was charged with the production of a vaccine, following his successful work in developing methods that helped to protect the important wine and silk industries.In May 1881, Pasteur – in collaboration with his assistants Jean-Joseph Henri Toussaint, Émile Roux and others – performed a public experiment at Pouilly-le-Fort to demonstrate his concept of vaccination. He prepared two groups of 25 sheep, one goat, and several cattle. The animals of one group were injected with an anthrax vaccine prepared by Pasteur twice, at an interval of 15 days; the control group was left unvaccinated. Thirty days after the first injection, both groups were injected with a culture of live anthrax bacteria. All the animals in the unvaccinated group died, while all of the animals in the vaccinated group survived.After this apparent triumph, which was widely reported in the local, national, and international press, Pasteur made strenuous efforts to export the vaccine beyond France. He used his celebrity status to establish Pasteur Institutes across Europe and Asia, and his nephew, Adrien Loir, travelled to Australia in 1888 to try to introduce the vaccine to combat anthrax in New South Wales.
A amoebic liver abscess is a type of liver abscess caused by amebiasis. It is the involvement of liver tissue by trophozoites of the organism Entamoeba histolytica and of its abscess due to necrosis. Presentation
Approximately 90% of patients with E histolytica are asymptomatic. The two most common manifestations of E histolytica include colitis (bloody stool with mucus, abdominal pain, and/or diarrhea), and discovery of a liver abscess on imaging. Liver abscess commonly present as right upper quadrant abdominal pain and fever, with worsening features associated with abscess rupture. Symptoms
Pain right hypochondrium referred to the right shoulder
Pyrexia (100.4 F)
Profuse sweating and rigors
Loss of weight
Earthy complexion

Signs
Pallor
Tenderness and rigidity in right hypochondrium
Palpable liver
Intercostal tenderness
Basal lung signs

Diagnosis
Diagnosis is primarily made by identifying stool ova and parasites on stool antigen testing in the presence of colitis, or E histolytica serology. Blood ceruloplasmin
Haemoglobin estimation
Stools examination (trophozoites and cysts)
Radiography
Aspiration exploratory
Medical ultrasonography and CT scanning
Sigmoidoscopy
Liver function tests
Serological tests

Rodent models
Due to the difficulty of exploring host and amebic factors involved in the pathogenesis of amebic liver abscess in humans, most studies have been conducted with animal models (e.g., mice, gerbils, and hamsters). Histopathological findings revealed that the chronic phase of amebic liver abscess in humans corresponds to lytic or liquefactive necrosis, whereas in rodent models there is granulomatous inflammation. However, the use of animal models has provided important information on molecules and mechanisms of the host/parasite interaction in amebic liver abscess. References


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