Rates of trichinosis in Chile have been steadily decreasing for over 30 years, but are still at levels reported in the United States during the 1950′s (see graphs). [1]

The following background is abstracted from Gideon www.GideonOnline.com and the Gideon e-book series. [2,3] (primary references are available on request)

Highest incidence of trichinosis in Chile is reported in the Metropolitan, VI, VIII and X Regions.
- Disease rates were 1.4 per 100,000 during the 1960′s, 0.7 per 100,000 during the 1980′s, 0.3 per 100,000 during 1993 and 1994, and 0.5 per 100,000 in 1995.
- 631 cases of trichinosis (4 fatal) were identified through active case-finding during 1991 to 2000.

Prevalence surveys:
2.2% of the population at autopsy in 1966; 3.4% in 1972; 2.8% in 1982; 0.8% in 1997
2% of the population at autopsy (Santiago, 1992)
1.67% of persons in Concepcion and Arauco at autopsy (1997 publication)

Seroprevalence surveys:
1.5% of the population (1983 to 1994)
4.7% in San Juan de la Costa County. Osorno, X Region (1990 to 1991)

Vehicles:
- Pig infestation rates were 0.683 per 1,000 during 1980 to 1984, 0.315 per 1,000 during 1985 to 1989; 0.115 per 1,000 during 1990 to 1996.
- 0.017% of pigs were found to be infested in 1991; 0.004 during 1998 to 2000.
- The country’s first case associated with wild boar (Sus scrofa) consumption was published in 2005.

Notable outbreaks:
1962 (publication year) – An outbreak of trichinosis was reported among members of a family in Santiago de Chile.
1973 (publication year) – An outbreak was reported in Santiago.
1982 (publication year) – An outbreak was reported in Concepcion.
1992 – An outbreak (36 cases) in Purranque County, X Region was ascribed to infested pork.
1999 – An outbreak (21 cases) in southern Chile was ascribed to infested pork.
1999 to 2000 – An outbreak was reported among pigs in the area southwest of Santiago
2010 – An outbreak (11 cases) was reported in Valdivia and La Union.

References:
1. Gideon graph tool tutorial at http://www.GIDEONonline.com/wp/wp-content/uploads/Gideon-Graphs.pps )

Berger SA. Infectious Diseases of Chile, 2011. 371 pages, 89 graphs, 1213 references. Gideon e-book series, http://www.gideononline.com/ebooks/country/infectious-diseases-of-chile/

3. Berger SA. Trichinosis: Global Status, 2011. 82 pages, 68 graphs, 695 references. Gideon e-book series,

http://www.gideononline.com/ebooks/disease/trichinosis-global-status/

A recent posting in ProMED noted that rates of tuberculosis in North Korea have been increasing at an alarming rate in recent years, in spite of a parallel improvement in the uptake of BCG vaccine in that country. Indeed, one of the oldest controversies in medicine concerns the effectiveness of BCG vaccination to prevent tuberculosis. As of 2011, over 85% of countries continue to routinely vaccinate infants with BCG vaccine.

The following analysis was undertaken to collate concurrent trends in tuberculosis rates and BCG vaccine uptake among countries which employ the vaccine. Data for tuberculosis incidence were obtained from the Gideon database (www.GideonOnline.com) which is largely based on reporting from individual Health Ministry reports and publications of the World Health Organization. Disease rates per 100,000 population are automatically generated by Gideon, and all charts summarized in a related e-book. [1] Country-specific estimates of BCG coverage were obtained from a WHO website: http://apps.who.int/immunization_monitoring/en/globalsummary/timeseries/tscoveragebcg.htm , and supplemented by individual reporting data at http://www.who.int/countries/en/ .

Individual charts were generated which plot tuberculosis rates and estimates of vaccine uptake. [2] Charts were then collated into three categories:

A) Tuberculosis rates appear to diminish in parallel with high (>=85%) and / or increasing vaccine uptake (examples in graph A)

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B) tuberculosis rates appear to increase in parallel with high and / or increasing vaccine uptake (examples in graph B)

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C) no consistent similarity is apparent between trends in tuberculosis rates and vaccine uptake (examples in graph C).

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The latter graph also includes examples of countries (Latvia, Peru and India) in which vaccine update was initially associated with increasing disease rates, and subsequently decreasing rates; and others (Sri Lanka) in which these effects were reversed.

No attempt was made to further examine these data using tests of statistical significance, trend analysis, etc. In the following table, assignment of individual countries is based simply on the existence of overt visible trends between disease rates and vaccine uptake:

Data presented in the table suggest that only 62 countries (36%) which employ BCG vaccination have demonstrated decreasing tuberculosis rates in parallel with increased vaccine uptake; while, 49 countries (28%) have actually experienced increasing disease rates despite adequate vaccine usage. There is no apparent relationship between vaccination and disease rates in the remaining 63 countries (36%) . Countries in which a paradoxical increase in tuberculosis has paralleled expanded vaccine uptake are concentrated in Africa, Asia and the Near East; while countries in which increasing vaccine uptake is paralleled by decreased incidence are concentrated in North Africa, the Middle East, Western Europe, Oceania and the Americas region. These trends are depicted in the following map:

The above analysis is not intended to imply a causal relationship between tuberculosis incidence and vaccine uptake. In fact, any impact of BCG vaccination on disease incidence might only become apparent after several years, given the long “incubation period” associated with reactivation tuberculosis. Additional factors which might impact on the incidence of tuberculosis in many of these countries include AIDS, malnutrition, crowding, civil conflict, drug resistance, nature of laboratory facilities, and systems for case-finding, patient isolation and follow-up.

References:
1. Berger SA. Tuberculosis: Global Status, 2011. 568 pages, 894 graphs, 1142 references. Gideon e-books, http://www.gideononline.com/ebooks/disease/tuberculosis-global-status/
2. Gideon graph tool tutorial at http://www.GIDEONonline.com/wp/wp-content/uploads/Gideon-Graphs.pps

Posted by ProMED

The following graphs summarize six decades of venereal diseases data for the United States. As described in a recent ProMED report, the incidence of syphilis has been rising since 1999. 1,2 Note that reports of chlamydial infection have increased arithmetically since the disease became reportable in 1994.

(Graph tool tutorial at
http://www.GIDEONonline.com/wp/wp-content/uploads/Gideon-Graphs.pps )

References:
1. Berger SA. Infectious Diseases of the United States, 2011. 1030 pages, 464 graphs, 8237 references. Gideon e-books, http://www.gideononline.com/ebooks/country/infectious-diseases-of-the-united-states/
2. Berger SA. Syphilis: Global Status, 2011. 231 pages, 336 graphs, 861 references. Gideon e-books, http://www.gideononline.com/ebooks/disease/syphilis-global-status/

Featured on ProMED

[comment on Tuberculosis, drug resistance - North Korea ]

Rates of tuberculosis in North Korea continue to increase at an alarming rates, and are currently similar to those reported in South Korea during the 1970′s (see graph below). Strangely, these increases have paralleled WHO estimates of BCG vaccine uptake in this country (yellow line in graph). 1,2

(Graph tool tutorial at http://www.GIDEONonline.com/wp/wp-content/uploads/Gideon-Graphs.pps )

References:
1. Berger SA. Infectious Diseases of North Korea, 2011. 315 pp, 25 graphs, 840 references. Gideon e-book series, http://www.gideononline.com/ebooks/country/infectious-diseases-of-north-korea/
2. Berger SA. Tuberculosis: Global Status, 2011. 568 pages, 894 graphs, 1142 references. Gideon e-book series, http://www.gideononline.com/ebooks/disease/tuberculosis-global-status/

Featured on ProMED

[comment on Hepatitis B - United States of America (California) Liver Cancer]

Changes in vaccination policy may not solve California’s “liver cancer epidemic.” In the United States as a whole, rates of Hepatitis B were had already declined significantly before the demonstration of effective vaccine uptake [1,2] See graph :

Vaccination of infected Asian immigrants cannot alter disease progression or public health risk among Asian immigrants who were already infected before arriving to California. The focus must be on testing and counseling of pregnant carriers and high-risk contact groups in this community. In any case, possible effects of increased vaccination on rates of liver cancer might not be apparent for several years, given the natural lag period from infection to tumor.

(See the Graph tool tutorial at www.GIDEONonline.com/wp/wp-content/uploads/Gideon-Graphs.pps )

References:
1. Berger SA. Infectious Diseases of the United States, 2011 publication. 1030 pp, 464 graphs, 8237 references. Gideon e-books, http://www.gideononline.com/ebooks/country/infectious-diseases-of-the-united-states/
2. Berger SA. Hepatitis B: Global Status, 2011. 327 pp, 405 graphs, 1517 references. Gideon e-books, http://www.gideononline.com/ebooks/disease/hepatitis-b-global-status/

Note cited by ProMED

The following background data on plague in Madagascar were abstracted from Gideon www.GideonOnline.com and the Gideon e-book series. [1,2] (Primary references are available on request)

Time and Place:
– Plague was first described in Madagascar in 1898, with cases in the harbor of Tamatave (Toamasina).
– The first epidemic occurred in Majunga in 1902 (142 fatal cases during May to July of that year).
– Subsequent outbreaks were reported in Majunja in 1907 (49 fatal cases), 1924 and 1928.
– The disease reached the central highlands in 1921, and remains endemic to this area at elevations above 800 m.
– Outbreaks of pneumonic plague were reported during 1921 to 1935; and in 1957 (northeast region).
– Plague was first reported in port areas of Madagascar in 1898; with later spread to the high plateau in 1921.
– During 1989 to 1992, 93% of cases were reported from “the plague triangle” located in the Central Highlands and delimited by Ambatondrazaka, Miarinarivo and Fianarantsoa.

Biology and transmission:
– Reservoirs implicated in transmission include the shrews (Suncus murinus) and rats (Rattus rattus).
– Infection has also been identified in hedgehogs (Tenrec ecaudatus).
– Possible flea vectors include Paractenopsyllus pauliani, Synopsyllus fonquerniei and Xenopsylla cheopis.

Incidence:
Two major waves of plague have been reported – with peak incidence in 1932 (3,656 cases) and 1997 (2,863 cases). See graph:

– 10,471 cases were reported during 1935 to 1949 ; 9,227 (448 fatal) during 1957 to 1986; 5,896 (493 fatal) during 1980 to 1997; 11,673 (950 fatal) during 1987 to 2001.
– Of 5,927 suspected cases reported during 1989 to 1995, 1,337 were bacteriologically-confirmed, with a case-fatality rate of 19%.
– 1,702 suspected cases (515 confirmed, 47 fatal) were reported in Mahajanga during 1995 to 1998.
– 91.3% of these cases were characterized as bubonic (67.8% of these involving the inguinal region).

Africa accounts for most of the world’s plague deaths. >=50% of these deaths are reported by Madagascar. See graph:

Seroprevalence surveys:
<1.5% to 15.5% in Majanga City (1997 publication)
0.61% of persons in Mahajanga (anti-F1 antibody, 1999)
3.2% of market vendors in Antananarivo (anti-F1 antibody, 1999)

Notable outbreaks:
1982 (publication year) – An outbreak (9 cases) was reported in Tananarive.
1991 – An outbreak was reported in Majunga.
1995 – An outbreak (108 confirmed and presumed cases) was reported in Mahajanga city.
1997 – An outbreak (2,863 cases, 176 fatal) was reported.
1998 – An outbreak was reported in a hamlet in the Ikongo district.
2008 – An outbreak (7 deaths) of pneumonic plague was reported in Toamasina.
2010 – An outbreak (31 cases, 1 fatal) was reported in La Libertad.
2011 – Outbreaks (200 cases, 60 fatal) were reported, including Antananarivo (3 fatal cases) and Antsiranana (16 fatal cases).

(outline of Gideon Graph module – see http://www.GIDEONonline.com/wp/wp-content/uploads/Gideon-Graphs.pps )

References:
1. Berger SA. Infectious Diseases of Madagascar, 2011. 49 pp, 47 graphs, 1,029 references. Gideon e-books, http://www.gideononline.com/ebooks/country/infectious-diseases-of-madagascar/
2. Berger SA. Plague: Global Status, 2011. 95 pages, 101 graphs, 485 references. Gideon e-books, http://www.gideononline.com/ebooks/disease/plague-global-status/

Notwitstanding a recent outbreak in Utah, infant botulism has accounted for an growing percentage of total cases in recent years. [1,2] In the following graph, I’ve summarized trends for botulism in the United States. Note that total case numbers have been increasing since 1995, despite a decrease in the incidence of food-borne botulism.

(See the Graph tool tutorial at www.GIDEONonline.com/wp/wp-content/uploads/Gideon-Graphs.pps )

References:
1. Berger SA. Infectious Diseases of the United States, 2011. 1030 pp, 464 graphs, 8237 references. Gideon e-books, www.gideononline.com/ebooks/country/infectious-diseases-of-the-united-states/
2. Berger SA. Botulism: Global Status, 2011. 80 pages, 86 graphs, 510 references. Gideon e-books, http://www.gideononline.com/ebooks/disease/botulism-global-status/

Notwithstanding a recent outbreak in Georgia, Cyclospora is the least common intestinal protozoan reported in the United States. [1] In the following chart, I have summarized the incidence of cyclosporiasis, giardiasis, amebiasis and cryptosporidiosis. As indicated at the black arrow, ongoing trends for amebiasis (no longer reported as of 1994 = 2,983 cases) were “continued” by reports of cryptosporidiosis (2,972 cases in 1995).

(outline of Gideon Graph module – see http://www.GIDEONonline.com/wp/wp-content/uploads/Gideon-Graphs.pps)

Reference:
1. Berger SA. Infectious Diseases of the United States, 2011. 1030 pp, 464 graphs, 8237 references. Gideon e-books, www.gideononline.com/ebooks/country/infectious-diseases-of-the-united-states/

Note published in ProMED

Rates of tick-borne encephalitis in Sweden are now well beyond those of surrounding countries, and have been increasing significantly since 2000. [1,2] See graph

(outline of Gideon Graph module – see http://www.GIDEONonline.com/wp/wp-content/uploads/Gideon-Graphs.pps )

References:
1. Berger SA. Infectious Diseases of Sweden, 2011. 427 pp, 133 graphs, 1346 references. Gideon E-books, http://www.gideononline.com/ebooks/country/infectious-diseases-of-sweden/2. Berger SA. Tick-borne Encephalitis: Global Status, 2011. 54 pp, 44 graphs, 314 references. Gideon E-books, http://www.gideononline.com/ebooks/disease/tick-borne-encephalitis-global-status/

Note discussed in ProMED

Although Listeria monocytogenes is a relatively uncommon cause of food-borne infection in the United States, this species is associated with a disproportionate mortality rate. In recent years, Salmonella and Listeria have been associated with more cases of fatal bacterial food related disease than any other agent, despite the the relative rarity of listeriosis as a disease. [1,2] In fact, case-fatality rates of the most common agent, Salmonella, have not paralleled increases in disease incidence. See graphs 1 and 2.

(See the Graph tool tutorial at http://www.GIDEONonline.com/wp/wp-content/uploads/Gideon-Graphs.pps )

References:
1. Berger SA. Infectious Diseases of the United States, 2011. 1030 pp, 464 graphs, 8237 references. Gideon e-books, http://www.gideononline.com/ebooks/country/infectious-diseases-of-the-united-states
2. Berger SA. Listeriosis: Global Status, 2011. 93 pp, 103 graphs, 487 references. Gideon e-books, http://www.gideononline.com/ebooks/disease/listeriosis-global-status/

Note disussed in Promed