Foodborne illness
Medical condition
Ciguatera fish poisoning
|
---|
Other names
| Ciguatera, ciguatera food poisoning
|
---|
![](//upload.wikimedia.org/wikipedia/commons/thumb/7/7d/Ciguatoxin.svg/220px-Ciguatoxin.svg.png) |
Chemical structure of
ciguatoxin
|
Specialty
| Toxicology
![Edit this on Wikidata](//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png) |
---|
Symptoms
| Diarrhea
, vomiting, numbness, itchiness, sensitivity to hot and cold,
dizziness
, weakness
[1]
[2]
|
---|
Usual onset
| 30 min to 2 days
[3]
|
---|
Duration
| Few weeks to months
[3]
|
---|
Causes
| polyether toxins within certain
reef fish
[2]
|
---|
Risk factors
| Barracuda
,
grouper
,
moray eel
,
amberjack
,
sea bass
,
sturgeon
fish
[2]
|
---|
Diagnostic method
| Based on symptoms and recently eating fish
[1]
|
---|
Differential diagnosis
| Paralytic shellfish poisoning
,
neurotoxic shellfish poisoning
,
scombroid food poisoning
,
pufferfish poisoning
[1]
|
---|
Treatment
| Mannitol
,
gabapentin
,
amitriptyline
[1]
[2]
|
---|
Prognosis
| Risk of death ~ 0.1%
[2]
|
---|
Frequency
| c.
50,000 per year
[2]
|
---|
Ciguatera fish poisoning
(
CFP
), also known as
ciguatera
, is a
foodborne illness
caused by eating
reef fish
contaminated with
ciguatoxins
.
[4]
[2]
Such individual fish are said to be
ciguatoxic
. Symptoms may include
diarrhea
, vomiting, numbness, itchiness, sensitivity to hot and cold,
dizziness
, and weakness.
[1]
[2]
The onset of symptoms varies with the amount of toxin eaten. If a lot of toxins are consumed symptoms may appear within half an hour. If a low amount of toxins are consumed symptoms make take a few days to appear.
[3]
Diarrhea may last up to four days.
[1]
Symptoms may last a few weeks to a few months.
[3]
Heart problems such as
slow heart rate
and
low blood pressure
may occur.
[2]
The specific toxins involved are ciguatoxin and
maitotoxin
.
[2]
They are originally made by a small
marine organism
,
Gambierdiscus toxicus
, that grows on and around
coral reefs
in
tropical
and
subtropical
waters.
[2]
These are eaten by
herbivorous
fish which in turn are eaten by larger
carnivorous
fish.
[2]
The toxins become
more concentrated
as they move up the
food chain
.
[3]
The fish most often implicated include
barracuda
,
grouper
,
moray eel
,
amberjack
,
sea bass
, and
sturgeon
.
[2]
Diagnosis is based on a person's symptoms together with having recently eaten fish.
[1]
If a number of those who eat the same fish develop symptoms the diagnosis becomes more likely.
[1]
If some of the fish they had previously eaten is available this can also be tested to confirm the diagnosis.
[1]
Preventive efforts include not eating reef fish, not eating high-risk fish such as barracuda, and not eating fish liver,
roe
, or fish heads.
[2]
Ciguatoxin has no taste or smell, and cannot be destroyed by conventional
cooking
.
[2]
There is no specific treatment for ciguatera fish poisoning once it occurs.
[2]
Mannitol
may be considered, but the evidence supporting its use is not very strong.
[1]
Gabapentin
or
amitriptyline
may be used to treat some of the symptoms.
[2]
In 2017, the
United States Centers for Disease Control
(CDC) estimated that around 50,000 cases occur globally each year.
[2]
Other estimates suggest up to 500,000 cases per year.
[1]
The risk of death from poisoning is less than 1 in 1,000 according to the CDC.
[2]
It is the most frequent
seafood poisoning
.
[3]
It occurs most commonly in the
Pacific Ocean
,
Indian Ocean
, and the
Caribbean Sea
between the
latitudes
of 35°N and 35°S.
[2]
The risk of the condition appears to be increasing due to coral reef deterioration and increasing trade in seafood.
[2]
Descriptions of the condition date back to at least 1511.
[3]
The current name, introduced in 1787, is of Cuban Spanish origin and originally referred to the
gastropod
Cittarium pica
.
[3]
Signs and symptoms
[
edit
]
Hallmark symptoms of ciguatera in humans include
gastrointestinal
, cardiovascular, and
neurological
effects.
[5]
[6]
Gastrointestinal symptoms include
nausea
,
vomiting
, and
diarrhea
, usually followed by neurological symptoms such as
headaches
, muscle aches,
paresthesia
, numbness of extremities, mouth and lips, reversal of hot and cold sensation,
[7]
[8]
ataxia
,
vertigo
, and
hallucinations
.
[9]
[6]
Severe cases of ciguatera can also result in cold
allodynia
, which is a burning sensation on contact with cold.
[5]
Neurological symptoms can persist and ciguatera poisoning is occasionally misdiagnosed as
multiple sclerosis
.
[10]
Cardiovascular symptoms include
bradycardia
,
tachycardia
, hypotension, hypertension, orthostatic tachycardia, exercise intolerance, and rhythm disorders.
[11]
Death from the condition can occur, but is very rare.
[12]
Dyspareunia
and other ciguatera symptoms have developed in otherwise healthy males and females following
sexual intercourse
with partners suffering ciguatera poisoning, signifying that the toxin may be sexually transmitted.
[13]
Diarrhea and facial rashes have been reported in breastfed infants of poisoned mothers, suggesting that ciguatera toxins migrate into breast milk.
[14]
The symptoms can last from weeks to years, and in extreme cases as long as 20 years, often leading to long-term disability.
[15]
Most people do recover slowly over time.
[16]
Cause
[
edit
]
Gambierdiscus toxicus
is the primary
dinoflagellate
responsible for the production of a number of similar
polyether
toxins, including ciguatoxin, maitotoxin and possibly
palytoxin
.
[17]
[18]
Other dinoflagellates that may cause ciguatera include
Prorocentrum
spp.,
Ostreopsis
spp.,
Coolia
spp.,
Thecadinium
spp. and
Amphidinium
spp.
[19]
Diagnosis
[
edit
]
Diagnosis is based on a person's symptoms together with having recently eaten fish.
[1]
If a number of those who eat the same fish have symptoms the diagnosis becomes more likely.
[1]
If some of the fish they had previously eaten is available this can also be tested to confirm the diagnosis.
[1]
Other potential causes such as
paralytic shellfish poisoning
(PSP),
neurotoxic shellfish poisoning
(NSP),
scombrotoxin fish poisoning
, and
pufferfish poisoning
should be excluded.
[1]
The reversal of hot and cold sensations is an occasional symptom of CFP that may help differentiate it from
norovirus
.
[20]
Treatment
[
edit
]
There is no known effective treatment or antidote for ciguatera poisoning. The mainstay of treatment is supportive care. There is some evidence that
calcium channel blockers
like
nifedipine
and
verapamil
are effective in treating some of the symptoms that remain after the initial sickness passes, such as poor circulation and shooting pains through the chest. These symptoms are due to
vasoconstriction
caused by maitotoxin.
[6]
[21]
[22]
[23]
Ciguatoxin lowers the threshold for opening
voltage-gated sodium channels
in
synapses
of the
nervous system
. Opening a sodium channel causes depolarization, which could sequentially cause paralysis, heart contraction, and changing the senses of hot and cold. Some medications such as amitriptyline may reduce some symptoms, such as
fatigue
and paresthesia,
[24]
although benefit does not occur in every case.
[25]
Mannitol
[
edit
]
Mannitol
was once used for poisoning after one study reported symptom reversal.
[6]
[26]
Follow-up studies in animals
[27]
and case reports in humans
[28]
also found benefit from mannitol. However, a randomized,
double-blind
clinical trial
found no difference between mannitol and normal
saline
.
[29]
Despite this its use may still be considered.
[1]
Epidemiology
[
edit
]
The current estimated global incidence annually is 20,000 to 50,000 people, though a large number of cases are believed to go unreported.
[30]
Due to the limited habitats of ciguatoxin-producing microorganisms, ciguatera is common only in
subtropical
and
tropical waters
, particularly the Pacific and Caribbean, and usually is associated with fish caught in tropical reef waters.
[5]
Exportation of reef fish, as well as tourism, often account for cases that develop in other regions.
[30]
Ciguatoxin is found in over 400 species of reef fish. Avoiding consumption of all reef fish is the only sure way to avoid exposure.
[31]
Imported fish served in restaurants may contain the toxin and produce illness which often goes unexplained by physicians unfamiliar with the symptoms of a tropical toxin.
[31]
[32]
Ciguatoxin can also occur in
farm-raised
salmon
.
[33]
Furthermore,
species substitution
, labeling a reef fish as a non-reef fish at restaurants and retail, can complicate efforts by consumers to avoid ciguatera.
[
citation needed
]
20th and 21st centuries
[
edit
]
- In 1994, Nobel-Prize winning novelist
Saul Bellow
nearly died from ciguatera after eating red snapper on vacation in St. Martin, fictionalized in his last novel
Ravelstein
.
[34]
- In 2007, ten people in
St. Louis, Missouri
developed the disease after eating imported fish.
[35]
- In February 2008, the
U.S. Food and Drug Administration
(FDA) traced several outbreaks to the
Flower Garden Banks National Marine Sanctuary
in the northern
Gulf of Mexico
, near the
Texas
?
Louisiana
shoreline. The FDA advised seafood processors that ciguatera poisoning was reasonably likely to occur from eating several species of fish caught as far as 50 miles (80 km) from the sanctuary.
[36]
- From August 2010 to July 2011, there were eight outbreaks of ciguatera fish poisoning in New York City. Outbreaks were linked to barracuda and grouper purchased at a fish market in Queens, New York.
[37]
- In the first quarter of 2012, two restaurants in
Lanzarote
,
Canary Islands
are thought to have been the source of ciguatera poisoning, leading to new fishing regulations issued 18 April 2012. The first outbreak was reported in February 2012. Diners suffered with vomiting, diarrhoea and abdominal pain several hours after eating amberjack. The second case was in early April affecting six people who live in Lanzarote and had all eaten amberjack at a local restaurant.
[38]
- In March 2014, nine people were hospitalised near Macksville, New South Wales, Australia after a recreational fisherman caught a 55 lb
Spanish mackerel
(
Scomberomorus commersoni
) off Scott's Head (NSW) and then shared it among his friends and family.
[39]
- In April 2015, fourteen crew members of a potash ship were hospitalized in Saint John, New Brunswick, Canada after consuming tropical fish obtained from international waters.
[40]
After the incident, Marine Catering Services issued a reminder to seafarers that the UK Food Act makes it illegal for crews to fish for food from their vessels.
[41]
- In September 2016, a British holidaymaker died while on honeymoon in Mexico after consuming fish contaminated with the algae that causes ciguatera poisoning.
[12]
- During October 2016, more than 100 people suffered from ciguatera poisoning after eating fish heads supplied by an export firm in Mangalore, India.
[42]
History
[
edit
]
Ciguatera was first described by one of the surgeon's mates,
William Anderson
, on the crew of
HMS
Resolution
in 1774.
[43]
Researchers suggest that ciguatera outbreaks caused by warm climatic conditions in part propelled the
migratory voyages of Polynesians
between 1000 and 1400 CE.
[44]
[45]
Folk tales
[
edit
]
In Northern Australia, where ciguatera is a common problem, two different
folk science
methods are widely believed to detect whether fish harbor significant ciguatoxin. The first method is that flies are supposed not to land on contaminated fish. The second is that cats will either refuse to eat or vomit/display symptoms after eating contaminated fish. A third, less common testing method involves putting a silver coin under the scales of the suspect fish. If the coin turns black, according to the theory, it is contaminated.
On
Grand Cayman
and other islands the locals will test barracuda by placing a piece of the fish on the ground and allowing ants to crawl on it. If the ants do not avoid the flesh and will eat it, then the fish is deemed safe.
[
citation needed
]
In Dominican Republic, another common belief is that during months whose names do not include the letter "R" (May through August), it is not recommended to eat certain kinds of fish, because they are more likely to be infected by the ciguatera toxin.
The validity of many of these tests has been scientifically rejected.
[46]
Folk remedies
[
edit
]
Leaves of
Heliotropium foertherianum
(Boraginaceae) ? also known as
octopus bush
? are used in many Pacific islands as a traditional medicine to treat ciguatera fish poisoning. Senescent octopus bush leaves contain
rosmarinic acid
and derivatives, which are known for their
antiviral
,
antibacterial
,
antioxidant
, and
anti-inflammatory
properties.
[47]
Rosmarinic acid may remove the ciguatoxins from their sites of action, as well as being an anti-inflammatory.
An account of ciguatera poisoning from a linguistics researcher living on Malakula island,
Vanuatu
, indicates the local treatment: "We had to go with what local people told us: avoid salt and any seafood. Eat sugary foods. And they gave us a tea made from the roots of ferns growing on tree trunks. I don't know if any of that helped, but after a few weeks, the symptoms faded away".
[48]
Various Caribbean folk and ritualistic treatments originated in
Cuba
and nearby islands. The most common old-time remedy involves bed rest subsequent to a
guanabana
juice
enema
.
[
citation needed
]
In
Puerto Rico
, natives drink a
tea
made from
mangrove
buttons, purportedly high in
B vitamins
, to flush the toxic symptoms from the system.
[
citation needed
]
There has never been a funded study of these treatments. Other folk treatments range from directly porting and bleeding the gastrointestinal tract to "cleansing" the diseased with a dove during a
Santeria
ritual.
[
citation needed
]
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References
[
edit
]
- Ciguatera fish poisoning
,
CDC
- Friedman, M. A.; Fernandez, M.; Backer, L. C.; Dickey, R. W.; Bernstein, J.; Schrank, K.; Kibler, S.; Stephan, W.; Gribble, M. O.; Bienfang, P.; Bowen, R. E.; Degrasse, S.; Flores Quintana, H. A.; Loeffler, C. R.; Weisman, R.; Blythe, D.; Berdalet, E.; Ayyar, R.; Clarkson-Townsend, D.; Swajian, K.; Benner, R.; Brewer, T.; Fleming, L. E. (2017).
"An Updated Review of Ciguatera Fish Poisoning: Clinical, Epidemiological, Environmental, and Public Health Management"
.
Marine Drugs
.
15
(3): 72.
doi
:
10.3390/md15030072
.
PMC
5367029
.
PMID
28335428
.
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