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  1. These Maps Lay Out Exactly Where to Find California's Gold ...

    www.bloomberg.com/news/articles/2014-01-24/these...

    Jan 24, 2014 · "Map of the mining district of California" (1850) Made two years into the Gold Rush, this map provides simple markings that indicate not only where the gold is, but where the Native Americans can ...

    • Mark Byrnes
    • at A Glance
    • Historical Trends
    • Seasonality
    • Geography
    • People at Risk
    The number of SFR cases has risen in the last two decades, from 495 cases in 2000, to a peak of 6,248 in 2017. However, cases reported in 2018 were slightly lower.
    Because of the inability to differentiate between spotted fever group Rickettsia species using commonly available serologic tests, it is unclear how many of those cases are RMSF, and how many resul...
    The number of SFR cases reported to CDC per year have generally increased over time with distinct increases since the mid-1990s.
    Notably, while the number of cases and incidence rose, the case fatality rate (i.e., the proportion of SFR patients that died as a result of infection) has declined since the 1940s when tetracyclin...
    The current case fatality rate for SFRs using surveillance data is still roughly 0.5% of cases.
    Although SFR cases can occur during any month of the year, most cases reported illness in May–August.
    This period coincides with the season when adult Dermacentorticks are most active.
    Seasonal trends may vary depending on the area of the country and tick species involved.
    SFR cases have been reported throughout the contiguous United States, although five states (Arkansas, Missouri, North Carolina, Tennessee, and Virginia) account for over 50% of SFR cases.
    In Arizona, RMSF cases have recently been identified in an area where the disease had not been previously seen. From 2003 to 2018, nearly 430 cases were reported with a case-fatality rate of about 5%.
    SFR cases are more frequently reported in men than in women.
    People over the age of 40 years account for the highest number of reported cases, however, children under 10 years old represent the highest number of reported deaths.
    Persons with glucose-6-phosphate dehydrogenase (G6PD) deficiency.
    Surveillance data shows higher risk for hospitalization in people with compromised immune systems (e.g., resulting from cancer treatments, advanced HIV infection, prior organ transplants, or some m...
  2. Spotted Fever Group Rickettsia (Rocky Mountain Spotted Fever ...

    www.cdph.ca.gov/Programs/CID/DCDC/Pages/Spotted...

    Spotted fever group Rickettsia are a group of bacteria that can cause disease in humans, specifically Rocky Mountain spotted fever (RMSF) and Pacific Coast tick fever (PCTF). The bacteria that cause RMSF and PCTF are transmitted by the bite of an infected tick.

  3. Weather history for places in California. Sign up for our email newsletter by entering your email address.

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  5. Old maps of California

    www.oldmapsonline.org/en/California

    Old maps of California on Old Maps Online. Discover the past of California on historical maps.

  6. A History Of California Wildfires

    projects.capradio.org/california-fire-history

    A History Of California Wildfires. See the perimeters of more than 100 years of California wildfires recorded by Cal Fire. Learn more about how climate change is fueling California's recent wildfires with CapRadio's coverage here and here.

  7. Old Historical Atlas Maps of California. This Historical California Map Collection are from original copies. Most historical maps of California were published in atlases and spans over 150 years of growth for the state. Some California maps years have cities, railroads, P.O. locations, township outlines, and other features useful to the ...

  8. Epidemic typhus - Wikipedia

    en.wikipedia.org/wiki/Epidemic_typhus

    Epidemic typhus is a form of typhus so named because the disease often causes epidemics following wars and natural disasters. Typhus is rare in industrialized countries, and occurs primarily in the colder, mountainous regions of central and east Africa, as well as Central and South America.

  9. California Topographic Maps by Topo Zone

    www.topozone.com/california

    Find California topo maps and topographic map data by clicking on the interactive map or searching for maps by place name and feature type. If you know the county in California where the topographical feature is located, then click on the county in the list above. Every map in the state of California is printable in full color topos.

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