Sushi Parasite Has Increased 283x in Nearly 40 Years
The population of a marine parasite that sometimes worms its way into sushi has increased by 283 times in the last nearly 40 years, a University of Washington (UW)-led study has found.
The study, published in Global Change Biology Thursday, reviewed the literature and found a significant rise in the abundance of the parasite Anisakis, or "herring worm." This isn't especially concerning for humans, who experience the worm as a nasty bout of food poisoning that then resolves, but it could have serious consequences for marine mammals, who play host to the parasites for years.
"One of the important implications of this study is that now we know there is this massive, rising health risk to marine mammals," study coauthor and UW School of Aquatic and Fishery Sciences assistant professor Chelsea Wood said in the UW press release. "It's not often considered that parasites might be the reason that some marine mammal populations are failing to bounce back. I hope this study encourages people to look at intestinal parasites as a potential cap on the population growth of endangered and threatened marine mammals."
The researchers looked at a total of 123 papers published between 1967 and 2017 to assess how the abundance of two marine parasites had changed over time: Anisakis and another parasite known as Pseudoterranova, or "cod worm." Anisakis abundance rose 283-fold from 1978 to 2015, while Pseudoterranova abundance did not change. This means that Anisakis has risen from less than one for every 100 hosts caught to more than one in every host caught, ScienceAlert explained.
Ironically, while Anisakis might threaten the health of marine mammals, its rise may have been triggered by their success.
"My gut is that this is about the improvements we've made in marine mammal conservation," Wood told ScienceAlert. "The time frame of our study directly overlaps with when a bunch of really important marine mammal legislation went into effect like the Marine Mammal Protection Act in 1972 and the international whaling commission moratorium on commercial whaling which came in the 1980s."
The one wrinkle in this theory is which mammals usually play host to the worm. Anisakis hatches in the ocean and first infects small animals like shrimp, the UW explained. They then make their way up the food web as the shrimp are eaten by fish, who are eaten by bigger fish, until they end up in the intestines of Cetaceans like whales or dolphins. Here they can live and reproduce for years, reentering the ocean in the animals' feces to start the cycle again.
While Anisakis abundance has risen, Pseudoterranova, which typically infects fish, sea lions and seals, has not. However, seals and sea lions have done much better than whales, Wood told ScienceAlert, which means one would expect Pseudoterranova abundance to have increased instead. However, she speculated it was possible the parasite was actually increasing because it had fewer hosts to pass through.
Other factors that could have caused the rise include the climate crisis and increased runoff from fertilizers, according to the press release.
So what happens if humans happen to ingest one of the worms? Nausea and vomiting that is unpleasant, but temporary.
"When they enter the intestine of a human, it's a great disappointment to the worm. They're not going to be able to complete their life cycle there," Wood told New Scientist.
Wood said that sushi lovers shouldn't worry, as chefs were expert de-wormers.
"I still eat sushi all the time," she told New Scientist.
However, if you are concerned, just cut your nigiri in half and look for worms yourself, she advised in the press release.
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By Lindsey Schneider, Joshua Sbicca and Stephanie Malin
The SARS-CoV-2 virus is novel, but pandemic threats to indigenous peoples are anything but new. Diseases like measles, smallpox and the Spanish flu have decimated Native American communities ever since the arrival of the first European colonizers.
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History Reverberates on Native Lands<p>Native communities in North America have been disrupted and displaced for centuries. Many face long-standing food and water <a href="http://www.nativepartnership.org/site/DocServer/2017-PWNA-NPRA-Food-Insecurity-Project-Grow.pdf?docID=7106" target="_blank">inequities</a> that are further complicated by this pandemic.</p><p>On the Navajo reservation, which covers more than 27,000 square miles in Arizona, Utah and New Mexico, 76% of households already <a href="https://www.researchgate.net/publication/235390130_High_levels_of_household_food_insecurity_on_the_Navajo_Nation" target="_blank">have trouble affording enough healthy food</a>, and the nearest grocery store is often hours away. COVID-related restrictions have further curtailed access to food supplies.</p><p>Clean water for basic sanitary measures like hand-washing is also scarce. Native Americans are <a href="http://uswateralliance.org/sites/uswateralliance.org/files/Closing%20the%20Water%20Access%20Gap%20in%20the%20United%20States_DIGITAL.pdf" target="_blank">19 times more likely</a> to lack indoor plumbing than whites in the U.S. Nearly one-third of Navajo households <a href="https://www.nbcnews.com/news/us-news/coronavirus-hits-indian-country-hard-exposing-infrastructure-disparities-n1186976" target="_blank">lack access to running water</a>.</p><p>Many <a href="https://www.cdc.gov/mmwr/volumes/69/wr/mm6915e3.htm" target="_blank">health issues</a> that can increase COVID-19 mortality rates occur at high levels among Native Americans. These <a href="http://www.ncai.org/news/articles/2020/03/18/the-national-congress-of-american-indians-calls-for-more-attention-to-covid-19-impacts-to-indian-country" target="_blank">underlying</a> and <a href="https://doi.org/10.1016/S0140-6736(20)30893-X" target="_blank">preexisting</a> conditions – things like hypertension, diabetes, obesity and cardiovascular disease – are <a href="https://www.cdc.gov/mmwr/volumes/69/wr/mm6913e2.htm" target="_blank">linked to diet</a> and stem from <a href="https://www.oupress.com/books/15107980/indigenous-food-sovereignty-in-the-united-sta" target="_blank">disruption and replacement</a> of Indigenous food systems.</p>
High Exposure Rates<p>These factors have clear health impacts. On the Navajo reservation, for instance, through May 27, 2020, <a href="https://www.navajo-nsn.gov/News%20Releases/OPVP/2020/May/FOR%20IMMEDIATE%20RELEASE%20-%201620%20recoveries_102%20new%20cases%20of%20COVID-19_and%20one%20more%20death%20reported.pdf" target="_blank">4,944 people</a> out of a population of 173,000 had tested positive for COVID-19, and 159 had died.</p><p>This infection rate per capita exceeds those in hot spots such as <a href="https://www.forbes.com/sites/alexandrasternlicht/2020/05/19/navajo-nation-has-most-coronavirus-infections-per-capita-in-us-beating-new-york-new-jersey/#11a4fac08b10" target="_blank">New York and New Jersey</a>. Importantly, however, it may also reflect a much <a href="https://www.sltrib.com/news/2020/04/19/navajo-nation-has-higher/" target="_blank">more proactive approach to testing</a> on reservations than in many other jurisdictions.</p><p>The fact that elderly people are especially vulnerable to COVID-19 could worsen the pandemic's effects in Indian Country. Elders are the <a href="https://ais.washington.edu/research/publications/spirits-our-whaling-ancestors" target="_blank">keepers of traditional knowledge, tribal languages and culture</a> – legacies whose loss already threatens the persistence of indigenous communities.</p><p>Elders also play key roles in preserving traditional plant and medicine knowledge. In the absence of COVID-19 interventions from Western medicine, many elders have been called on to perform healing practices, which increases their exposure risk.</p>
Little Help From Federal and State Governments<p>Many tribal members rely on the federal government's <a href="https://www.ihs.gov/" target="_blank">Indian Health Service</a> for health care. But <a href="https://theconversation.com/tribal-leaders-face-great-need-and-dont-have-enough-resources-to-respond-to-the-coronavirus-pandemic-134372" target="_blank">lack of capacity</a> at the agency has hampered its response. Budget shortfalls, <a href="https://indiancountrytoday.com/news/report-grossly-inaccurate-data-used-to-divvy-up-relief-funds-for-tribes-9qkkHmeXj0uhRC42mXYqCA" target="_blank">inaccurate data</a>, the challenges of providing <a href="https://indiancountrytoday.com/news/coronavirus-risk-is-compounded-by-the-rural-DC-rMTUzzE6WDGee8jbENQ" target="_blank">rural health care</a> and ongoing personnel shortages in IHS clinics are compounded by staff being <a href="https://navajotimes.com/reznews/dikos-ntsaaigii-doodaa-nation-musters-defense-against-covid-19/" target="_blank">pulled away</a> to fight the virus in large cities.</p><p>And while many states have raised frustrations with the Trump administration's unwillingness to distribute protective supplies from the <a href="https://www.vox.com/recode/2020/4/3/21206170/us-emergency-stockpile-jared-kushner-almost-empty-coronavirus-medical-supplies-ventilators" target="_blank">dwindling national stockpile</a>, IHS and tribal health care authorities <a href="https://www.azpm.org/p/home-articles-news/2020/3/17/167874-bill-calls-for-more-tribal-community-access-to-federal-stockpile-of-medical-supplies/" target="_blank">never had access</a> to the stockpile at all.</p><p>Although the federal government has begun <a href="https://www.hhs.gov/about/news/2020/05/22/hhs-announces-500-million-distribution-to-tribal-hospitals-clinics-and-urban-health-centers.html" target="_blank">distributing relief funds</a> to IHS agencies, there have been serious problems with the accompanying supplies. The Navajo Nation has received <a href="https://www.indianz.com/News/2020/05/22/propublica-former-trump-aide-provided-fa.asp" target="_blank">faulty masks</a>, and a Seattle Native health center asked for tests but <a href="https://www.nbcnews.com/news/us-news/native-american-health-center-asked-covid-19-supplies-they-got-n1200246" target="_blank">received body bags instead</a>.</p><p>Meanwhile, federally imposed limits on tribal sovereignty have obstructed tribal governments' efforts to deal with the pandemic themselves. Federal and state governments are <a href="https://www.seattletimes.com/seattle-news/makah-tribe-fights-coronavirus-with-self-reliance-and-extreme-isolation/" target="_blank">challenging tribes' jurisdictional authority</a> to <a href="https://www.azfamily.com/news/mayor-of-page-accused-of-racist-social-media-comment-toward-navajo-nation-president/article_e2e6efd6-8db4-11ea-a8a2-7f6976d702f6.html" target="_blank">close borders to tourists</a> who may carry the virus. South Dakota's governor has <a href="https://www.theguardian.com/us-news/2020/may/14/sioux-coronavirus-roadblocks-south-dakota-governor" target="_blank">threatened legal action</a> against two tribes who set up checkpoints to monitor incoming traffic on their reservations.</p>
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Environmental Injustices on Native Land<p>Energy development and resource extraction have had <a href="https://www.haymarketbooks.org/books/898-all-our-relations" target="_blank">disproportionate impacts</a> on tribes for many years. Today, many Native American leaders worry that ongoing energy production – <a href="https://www.ncsl.org/research/labor-and-employment/covid-19-essential-workers-in-the-states.aspx" target="_blank">an "essential" activity under federal guidelines</a> will bring outsiders into close contact with reservation communities, worsening COVID risks.</p><p>The owners of the Keystone XL oil pipeline have announced that they intend to continue construction, which will bring an influx of workers along the proposed route through Montana, South Dakota and Nebraska. The Rosebud Sioux Tribe in South Dakota and Fort Belknap Indian community in Montana have filed for a <a href="https://www.narf.org/keystone-xl/" target="_blank">temporary restraining order</a>, and a key permit for the pipeline was <a href="https://www.democracynow.org/2020/4/16/headlines/us_judge_revokes_crucial_permit_for_keystone_xl_pipeline" target="_blank">revoked in April 2020</a>, but work continues at the U.S.-Canada border.</p><p>Construction is accelerating on the <a href="https://www.azcentral.com/story/news/politics/border-issues/2020/03/17/border-patrol-waives-laws-border-wall-construction-southern-arizona/5063618002/" target="_blank">southern border wall</a>, which bisects the <a href="http://www.tonation-nsn.gov/" target="_blank">Tohono O'odham reservation</a> in Arizona and Mexico. The Trump administration has <a href="https://www.thenation.com/article/politics/border-coronavirus-military-immigration/" target="_blank">increased patrols at the border</a>, despite the tribe's concern that the patrols' presence is <a href="https://www.usatoday.com/story/news/nation/2020/04/06/coronavirus-cbp-160-cases-covid-19-officers-agents/2958736001/" target="_blank">spreading coronavirus</a> on the reservation.</p><p>And in Bristol Bay, Alaska, a salmon fishing season that brings in thousands of temporary workers is <a href="https://indiancountrytoday.com/news/it-s-hard-when-you-love-something-xlS49l2N20KZjqumwfzZfQ" target="_blank">set to open in June</a> because the federal government has also deemed commercial fishing "<a href="https://www.cisa.gov/sites/default/files/publications/CISA-Guidance-on-Essential-Critical-Infrastructure-Workers-1-20-508c.pdf" target="_blank">essential critical infrastructure</a>." Many local Native villages depend on the fishery for income, but have nonetheless pleaded with state regulators to <a href="https://indiancountrytoday.com/news/urgent-calls-to-close-the-massive-bristol-bay-fishery-8lYsGkUeDUyCBW7FMwpSfA?fbclid=IwAR1710u4rQnriq_MgH2ueQxOFtfGiGiH8I2ZdJRCZS9f28Zl-JNkPLpnzZo" target="_blank">cancel the season</a>. The regional hospital has just four beds for possible COVID-19 patients.</p>
Bold Action in Native Communities<p>Native communities are taking decisive action to reduce the spread of COVID-19. They're imposing aggressive <a href="https://www.nytimes.com/2020/04/09/us/coronavirus-navajo-nation.html" target="_blank">quarantine</a> measures like lockdowns, curfews and border closures. Communities are <a href="https://www.theguardian.com/us-news/2020/mar/18/covidcoronavirus-native-american-lummi-nation-trailblazing-steps" target="_blank">ramping up health care capacity</a> and elder support services, and banishing nontribal members who <a href="https://rapidcityjournal.com/news/local/oglala-sioux-council-banishes-non-member-with-covid-19-from-reservation/article_60b665c3-9d1b-5d48-a576-51774e4fb41a.html" target="_blank">violate travel restrictions</a>.</p><p>Other strategies include helping hunters <a href="https://indiancountrytoday.com/news/ammo-fuel-for-hunters-to-feed-others-Ki3zK6du-ky-UogoB9-aNQ" target="_blank">provide traditional foods</a> to their communities, <a href="https://ndncollective.org/indigenizing-and-decolonizing-community-care-in-response-to-covid-19/" target="_blank">mobilizing to support tribal health care workers</a>, and <a href="https://www.ehn.org/coronavirus-native-americans-2645923635.html" target="_blank">linking the pandemic and the climate crisis</a>. Looking ahead to a post-COVID future, we believe one priority should be attending to <a href="http://www.beacon.org/As-Long-as-Grass-Grows-P1445.aspx" target="_blank">front-line environmental justice struggles</a> that center tribes' sovereignty to act on their own behalf at all times, not just during national crises.</p>
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