Market1929–1930 psittacosis pandemic
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1929–1930 psittacosis pandemic

The 1929–1930 psittacosis pandemic, also known as the psittacosis outbreak of 1929–1930 and the great parrot fever pandemic, was a series of simultaneous outbreaks of psittacosis which, accelerated by the breeding and transportation of birds in crowded containers for the purpose of trade, was initially seen to have its origin in parrots from South America. It was shortly found to have spread from several species of birds from several countries worldwide to humans between mid 1929 and early 1930. Diagnosed by its clinical features and link to birds, it affected around 750 to 800 people globally, with a mortality of 15%. Its mode of transmission to humans by mouth-to-beak contact or inhaling dried bird secretions and droppings was not known at the time. The cause, Chlamydia psittaci, which usually remains dormant in birds until activated by stress of capture and confinement, was discovered after the pandemic.

Background
In 1880, Swiss physician Jakob Ritter described a cluster of seven people with atypical pneumonia connected to his brother's household in Uster. In that house were 12 finches and parrots confined in the study. Subsequently, further similar outbreaks with a coincidence of exposure to birds appeared in other parts of Europe, including Paris in the 1890s, where it killed one in three affected people. The outbreaks ended following bans in bird trading. Subsequently, greater efforts were made to find the cause of the disease, but without success. The disease in birds was named psittacosis in 1895 by Antonin Morange. Prior to the 1929 outbreak of psittacosis in the United States, the last known cases were in 1917, found in captive birds in the basement of a department store in Pennsylvania. ==Origin and global spread==
Origin and global spread
There were multiple origins, involving several countries and several species of birds. By early 1930, the disease was reported in humans in several countries around the world, accelerated by the popular hobby of domestic bird-keeping at the time. Many cases and clusters had links with sick parrots. Around 750 to 800 people were affected. The average mortality was 15%, with a total of more than 100 deaths. The majority of cases in the U.S. were found in 1931 to be linked to endemic psittacosis in California, associated with the increasingly popular trade of breeding lovebirds for sale chiefly to housewives and widows. ==Africa==
Africa
Algiers In Algiers, four deaths were attributed to the disease in the week ending 8 February 1930. The following week, three further cases were reported. ==Europe==
Europe
When cases appeared in Amsterdam, Netherlands Health Department asked that steamships that call at South American seaports refuse to take on board parrots. Germany Cases in Germany were reported, with some uncertainty, from July 1929, in Berlin, Hamburg, Liegnitz, Munich, Glauchau and Dôbeln. It resulted in the banning of the importation of parrots. Of 35 parakeets involved in the German cases, 30 had no disease. Research into the cause was commenced by Samuel Bedson at the London Hospital. It prohibited the trade of parrots unless for research. ==North America==
North America
In 1929, around 500,000 canaries and nearly 50,000 parrots were imported to the United States from Brazil, Argentina, Colombia, Cuba, Trinidad, Salvador, Mexico and Japan. Most birds entered the U.S. via New York, except budgerigars, which entered via San Francisco and Los Angeles. 10 days before Christmas, Simon Martin, secretary of the Chamber of Commerce in Annapolis, Maryland, bought a parrot in Baltimore for his wife, who subsequently, along with their daughter and son-in-law, became seriously ill. Their new parrot's feathers had become dirty and ruffled by Christmas Eve, and on Christmas Day it died. The wife of the family physician made a link to a newspaper article about "parrot fever" in Buenos Aires. In consequence, Martin's physician sent a telegram to the United States Public Health Service (PHS) in Washington DC, requesting for advice on parrot fever. The story came to the attention of Surgeon General Hugh S. Cumming, who received similar messages from Baltimore, New York, Ohio and California. The task of solving the cause of parrot fever was signposted to George W. McCoy, the director of PHS's Hygienic Laboratory and a renowned bacteriologist who had discovered tularaemia, and his deputy, Charlie Armstrong, neither of whom had ever heard of parrot fever. Reports soon began to follow from the eastern coast of the U. S., with Baltimore, New York City and Los Angeles, involving other birds such as shell parakeets (Australian budgerigars). The director of the Bureau of Communicable Diseases, Daniel S. Hatfield, ordered the confiscation of all birds at Baltimore pet stores. February 1930 Two of the 16 people that developed the illness from exposure at the National Hygiene Laboratory died, including, on 8 February, Anderson. Its story was retold in Paul de Kruif's, Men Against Death (1933). ==South America==
South America
The first reports of the disease were recorded in July 1929, in Córdoba, Argentina. During the summer and autumn of 1929, Córdoba and Tucumán in Argentina, reported over 100 cases of a severe atypical pneumonia linked to a large shipment of birds from Brazil. ==Countries affected==
Countries affected
There were no reported cases in Brazil. The disease was reported in: • AlgeriaArgentinaAustraliaAustriaCanadaCzechoslovakiaDenmarkEgyptFranceGermanyHonoluluItalyJapanMexicoNetherlandsPolandSpainSwedenSwitzerlandUnited KingdomUnited States ==Birds involved==
Birds involved
Meyer later demonstrated that psittacosis could be transmitted by around 50 species of birds. Birds implicated in the 1929–30 pandemic included: • Amazon parrots (Amazona species) • Canary (Serinus canaria) • Lovebirds (Agapornis species) • Shell parakeets (Australian budgerigars, Melopsittacus undulatus). • Talking parrots • Grey parrots (Psittacus erithacus) • Thrushes Gallery File:Serinus canaria 3.jpg|Canary (Serinus canaria) File:Melopsittacus undulatus Alice Springs Desert Park (crop 2).jpg|Budgerigar (Melopsittacus undulatus) File:Agapornis roseicollis -eating grass seeds-8.jpg|Peach-faced lovebird (Agapornis roseicollis) File:Amazona amazonica 2c.jpg|Orange-winged amazon (Amazona amazonica) File:Psittacus erithacus -perching on tray-8d.jpg|African grey parrot (Psittacus erithacus) ==Notes==
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