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It looks like American Cyanamid's product was a Manufacturing Use concentrate, only to be used by other companies to manufacture actual end use products. Their registration was transferred to Clarke Mosquito Control Products in 1997 after the pesticide portion of the company was bought by BASF, and it was one of the ones cancelled between 2011 and 2015.
 
Dr Robert Bartholomew and Dr Robert W. Baloh contest the insecticide hypothesis

Challenging the diagnosis of ‘Havana Syndrome’ as a novel clinical entity (Journal of the Royal Society of Medicine, Oct. 1, 2019)

Emotional trauma and fear most likely cause of 'Havana Syndrome' (Eureka Alert, Oct. 31, 2019)

Havana Syndrome: ‘Emotional trauma and fear’ most likely cause of illness among US diplomats in Cuba, not mysterious sonic weapons (Independent, Nov. 1, 2019)

Havana Syndrome: 'Emotional trauma and fear' most likely cause of illness among US diplomats in Cuba, not mysterious sonic weapons (MSM.com, Nov. 1, 2019)

Cubans launching sonic attacks on US embassy? Not what we're hearing, say medical boffins (The Register, Nov. 1, 2019)

Challenging the diagnosis of ‘Havana Syndrome’ as a novel clinical entity (Journal of the Royal Society of Medicine, Oct. 1, 2019)

No hubo armas ni ataques sónicos en La Habana, reafirman especialistas (Medium, Nov. 2, 2019)

To date, there have been four studies of either U.S. or Canadian embassy diplomats who reported falling ill in Cuba under mysterious circumstances. The most recent suggests that the culprit is insecticide fumigation. There are so many problems with this study; it is hard to know where to begin.
If it’s true, where is the outbreak of concussion-like symptoms across Cuba and around the world? Supposedly, both embassies had been heavily sprayed at intervals—but other buildings in Cuba and around the world have also. How come non-diplomats working at the embassies and in the affected buildings weren’t affected? What happened to all of those people hearing noises and falling sick? How come the Canadian illness experiences were different than the Americans? It doesn’t make sense.
An Open Letter to the Diplomats With "Havana Syndrome" (Psychology Today, Nov. 2, 2019)


The questions raised by Robert Bartholomew in the Psychology Today article appear to be the ones that the researchers behind the Dalhousie study along with Cuban researchers are now investigating.
 
More articles based on the Bartholomew/Baloh article in JRSM

The paper’s lead author, Dr. Robert Bartholomew, concludes that ‘Havana Syndrome’ is more akin to shell shock, with the symptoms paralleling those associated with war trauma. “A characteristic feature of combat syndromes over the past century is the appearance of an array of neurological complaints from an overstimulated nervous system that are commonly misdiagnosed as concussions and brain damage,” he writes. He adds: “A signature feature of shell shock was concussion-like symptoms. Like today, their appearance initially baffled physicians until a more careful review of the data determined that what they were seeing was an epidemic of psychogenic illness. In fact, some of the descriptions from 100 years ago are virtually identical, right down to the use of the phrase ‘concussion-like symptoms’.”
Shell Shock: A New Study on ‘Havana Syndrome’ With a Stunning Conclusion (Sci Tech Daily, Oct. 31, 2019)


'Havana Syndrome' of US diplomats likely caused by paranoia not sonic weapon, study claims (Telegraph, Nov. 1, 2019)

’Emotional trauma’ caused illness at US Cuban embassy, report finds (NewsTalk, Nov. 1, 2019)

The so-called Havana Syndrome was caused by emotional trauma and fear rather than something new and sinister, according to the latest take on an intriguing saga.
A sociologist and a specialist in neurodegenerative diseases say the US and Canadian diplomats who recently reported a mystery illness while stationed in Cuba were participants in a continuation of the Cold War, living in a hostile foreign country where they were under constant surveillance.
In paper published in the Journal of the Royal Society of Medicine, Robert Bartholomew and Robert Baloh argue that at the time embassy staff were living in a cauldron of stress and uncertainty, amid rumours of an enigmatic sonic weapon.
Was the Havana Syndrome just an old cold lingering? (Cosmos Magazine, Nov. 4, 2019)


In their commentary, Bartholomew and Baloh did not directly address the Canadian study that pointed to fumigation related to the mosquito-borne Zika virus as a likely cause of Havana Syndrome. Nor did they refer to the study published in JAMA earlier this year that found unique differences in the brains of the former diplomats. The U.S. State department, meanwhile, has hypothesized that some sort of attack caused the symptoms.
In an email, though, Bartholomew dismissed the studies as: “Two more examples of dubious science.”
He said the explanation that Havana Syndrome is really a type of psychogenic war trauma makes the most sense.
“This explanation is by far the most likely explanation: a combination of mass psychogenic illness and a redefining of everyday aches and pains,” said Bartholomew. “It is firmly rooted in the prosaic. There is no need to resort to exotic hypotheses like sonic weapons or microwaves.”
New paper adds to Havana Syndrome mystery, suggests cause was stress, not high-tech attacks (Ottawa Citizen, Nov. 5, 2019)
 
:thumbsup: @dann.

I don't understand why people are still trying to make this issue anything but hysteria.

CSPAN had an excellent talk about US Cuban relations on the other day and the embassy illnesses was brought up among the dozens of important issues the speaker discussed.

U.S.-Cuba Relations
Miguel Fraga, first secretary of the Cuban Embassy in Washington D.C., spoke about U.S.-Cuba relations. He talked about the impact of the U.S. embargo, the changes on the island over the preceding five years, pop culture and media influences, and how Cubans perceived foreign policy in the United States. Mr. Fraga referenced the U.N. General Assembly resolution that was happening during his presentation, which called for the end of the embargo. 187 countries voted in favor of the resolution while three countries -- the U.S., Brazil, and Israel -- voted against the resolution.

As usual CSPAN programs are long, an hour and a half in this case. There is a transcript and it is free to stream online. I thought it was an excellent talk.

The discussion of the 'sonic attack' accusation is around the 1 hour mark.
 
The sonic-attack story is more or less dead, i.e. anybody with a bit of common sense knew that it was a fairytale as soon as the recording was revealed to be crickets.
However, the State Department isn't troubled by common sense.

However, the Dalhousie study doesn't seem to be as far-fetched as the attack paranoia, and I don't think that Bartholomew presents any real argument against it in his dismissal of all other hypotheses than his own.
I don't know why he seems to be so unwilling to consider it: If some of the embassy workers actually do suffer from organic damages (brain-blood-barrier problems) from exposure to insecticide, it would make it seem more likely that those who had all kinds of symptoms but no actual damages suffered from mass psychogenic illness only. That would also explain why their symptoms disappeared so fast.

Granma and all other Cuban media are full of articles about the UN resolution:
U.S. pressure to undermine support for UN resolution against the blockade denounced (Granma, Nov. 5, 2019)
LIVE: 187 votes in favor of Cuba leave the United States looking bad before the world (Granma, Nov. 7, 2019)
Truth and justice triumph: 187 countries against the U.S. blockade of Cuba (Granma, Nov. 8, 2019)
Bruno Rodríguez: Cuba has been the victim of the most unjust, severe, prolonged system of sanctions that has even been imposed on any country (Granma, Nov. 8, 2019)

This is an annual occurrence, unfortunately, and the USA ignores it every time.
 
This does not appear to be big news - in Canada or elsewhere:

Federal government lawyers are arguing that five diplomats and their families have made “excessive” and “exaggerated” claims in a $28-million lawsuit filed over mysterious injuries suffered while stationed in Cuba.
They’re asking a judge to toss the lawsuit, which alleges negligence and a cover-up over the so-called “Havana Syndrome” — strange injuries the lawsuit speculates may have been caused by a “sonic or microwave weapon” initially aimed at American officials.
In court filing, Canadian government argues diplomats exaggerated 'Havana Syndrome' claims behind $28M lawsuit
An independent environmental assessment of Canadian staff quarters in Havana 'revealed no evidence of unusual environmental phenomena'
(National Post, Nov. 26, 2019)


I'm surprised that the lawsuit now, after the Dalhousie study, still talks about a "sonic or microwave weapon." It would appear to me that they would have had a much better case if they had referred to fumigación and insecticides instead.
I wonder what exactly it's supposed to mean when it says that the independent environmental assessment "revealed no evidence of unusual environmental phenomena." It doesn't say if they looked for or found residue of the chemicals that the Dalhousie study suspects to have caused the Canadian diplomatic families' symptoms.
 
Miscellaneous

The first one, from July, makes it clear why the Trump Administration feels threatened by independent science and doesn't want to fund it:
More recently, the Jasons determined that a rare jungle cricket, not a mysterious radio frequency weapon, likely caused the odd sound that U.S. diplomats in Cuba had suspected caused them to fall ill in late 2016. No definitive cause of the illnesses has been determined.
Special Report: Inside a Trump-era purge of military scientists at a legendary think tank (Reuters, July 30, 2019)


A Canadian felt weird while in Havana so he must have been attacked, right?!
The man, who has asked to remain anonymous because he is worried about his safety, says he experienced what he calls an “attack” while in his hotel room in downtown Havana in early 2017. He was there as part of a privately sponsored trade mission.
He was sitting in his hotel room when he experienced a sensation inside his head that he has a hard time describing more than two years later.
Businessman says he suffers from Havana syndrome after incident during trade mission (Ottawa Citizen, Oct. 9, 2019)


A brand-new article from CNN:
New details on diplomat's mysterious brain injury linked to 'sonic attacks' (CNN, Dec. 19, 2019
Based on this report:
Neuroscientific Report on Quantitative MRI Volumetrics and Diffusion Tensor Imaging - Client: Mark Lenzi (Concussion Foundation, Oct. 23, 2019)
 
The Daily Mail has not only heard about the brain damage of U.S. (more or less) diplomatic employees.
Apparently, their investigative journalist has also spent time counting them! :)
American diplomat suffered 20 brain injuries in 'sonic attack' that affected dozens of staff in Cuba and China - but what caused them is still a mystery, new study says (Daily Mail, Dec. 20, 2019)

And then there's this from Reuters:
U.S. diplomats who mysteriously fell ill in Cuba and China would get long-term emergency health and other benefits under a $1.4 trillion spending bill lawmakers unveiled on Monday.
Over 40 U.S. government employees were affected by the incidents, which started in 2017 and have not been explained. They helped lead President Donald Trump to reduce staffing at the country’s mission in Cuba.
‘Havana Syndrome’ U.S. diplomats get benefits in spending bill (Reuters, Dec. 16, 2019)

(They have been explained, by the way, even though researchers can't agree on the explanation. However, nowadays only the State Department seems to consider them to be attacks.)
 
This is probably where The Daily Mail, Dec. 20, 2019, got its idea of "20 brain injuries" from:

Among the MRI findings: 20 brain regions with "abnormally low" volumes, including regions involved in memory, emotional regulation and motor skills that may correlate with Lenzi's symptoms, doctors said. Of the 107 regions they looked at, they also found three that had bigger volumes.
New details on diplomat's mysterious brain injury linked to 'sonic attacks' (CNN, Dec. 19, 2019)
 
This is probably where The Daily Mail, Dec. 20, 2019, got its idea of "20 brain injuries" from:

The idea there's any correlation with the Cuba complaints or even with 'sonic' injury is not supported by that article. Then there is this highlighted bit:
Researchers revealed the results of an independent brain analysis of Mark Lenzi, a US diplomat who was stationed in Guangzhou, China, in 2017 when he started experiencing unexplained symptoms including headache, difficulty reading, irritability, as well as memory and sleep problems.

You can interview 100 random people at the mall and you'l find at least one person and probably more with those symptoms.
 
The idea there's any correlation with the Cuba complaints or even with 'sonic' injury is not supported by that article.


No, it isn't. But that won't stop somebody who writes for the Daily Mail. They also can't be expected to look up CNN's source and read it for themselves.

Then there is this highlighted bit:

You can interview 100 random people at the mall and you'l find at least one person and probably more with those symptoms.


But it will be more difficult to find somebody with "20 brain injuries," even among Daily Mail reporters, I think.
 
Fumigación en Cuba (1:50-2:00; I hope they weren't using actual insecticide):
LAZOS de ELEGANCIA y LIUSMEL "MI HABANA" SALSA CUBANA 2013

Fumigación contra el dengue seems to happen much the same way all over Latin America with fumigation workers often wearing no protection at all:
 
Hidden within ”a rush transcript from "Special Report," February 7, 2020,” I found this:

And tonight's "WHATEVER HAPPENED TO?" segment, the acoustic attacks that caused health problems for U.S. diplomats in Cuba. John in Tallahassee e- mailed us with this question.


After a very short summary of the course of event, including the crickets, the segment ends with this:

EDSON: A senior U.S. diplomat tells Fox News there is still no consensus if there were actual injuries, and if so, what caused them? The State Department is paying for medical evaluation and treatment. There was some diplomats have said that's too little too late.
EDSON: The source familiar with the situation, says many of the effective diplomats have returned to work at the State Department and Foreign Service, others have retired. As officials are still trying to figure out what exactly caused this illness. Bret.
BAIER: Rich Edson, live at the State Department. Rich, thank you.
Motion Picture Association CEO on state of film industry, Trump's trade policy and Hollywood's economic impact (Fox News, Feb. 7, 2020)
 
HAVANA (AP) - Some scientists who gathered Monday for a two-day conference on the mysterious illnesses suffered by U.S. and Canadian diplomats in Havana said they suspected pesticides as a possible culprit, although results remained inconclusive.
(...)
The conference entitled “Is There a Havana Syndrome?” brought together Cuban scientists with researchers from universities in Halifax, Canada, Edinburgh, Scotland, the universities of California at Los Angeles and San Diego.
Scientists meet in Havana on diplomats' mystery illnesses (Washington Post/AP, March 2, 2020)


Pesticide-induced brain damage - It’s not just for diplomats anymore:
Pesticides damage the brains of baby bees, new research finds (CNN, March 4, 2020)
 
The Cuban newspaper Granma about the same conference in Havana:

During the conference, which included the participation of researchers from the United States, Canada, New Zealand, the United Kingdom and Cuba, specialists agreed that the term Havana Syndrome "is a media fabrication," that "There is no evidence to indicate the existence of a new disease," and that the accusations "do not stand up to serious scientific analysis."
No scientific evidence to support allegations of sonic attacks (Granma, March 4, 2020)
 
Articles about the scientific conference in March mentioned in the two previous posts:

Scientists study pesticide link to diplomats' 'Havana syndrome' (MedicalXpress, March 3, 2020)
Scientists meet in Havana on diplomats' mystery illnesses (ABC News, March 3, 2020)
Havana Syndrome lacks evidence -- scientists (XinhuaNet, March 3, 2020)
El “Síndrome de La Habana” a debate en Cuba (OnCubaNews, March 2, 2020)

“That someone has been persecuting diplomats throughout Havana with mysterious rays or an unknown sound equipment, as was said at the beginning, violates the laws of science; it’s science fiction. Nor is there evidence of damage by these supposed sounds in the white matter of the brain, because the causes of these reports can be many, even prior to the incidents. However, both things were given great importance in the press at the time,” says the director of CNEURO.

“We also believe that if the U.S. government repeated tells the diplomats that they are under attack, it gives them stress and acts as an amplifier of any symptoms,” he adds. “It doesn’t mean that they cannot be sick, but the existence of a theory like that of the sonic weapon, repeated even without bases, can confuse people more than help them, and hinder the way they interpret their condition.”

Even so, this hypothesis marked the course of the initial studies, including those of Cuba’s own inquiry commission.

“Initially the problem of hearing loss was important and that is why we focused on that, but now it has been shown that really no diplomat has acquired hearing losses while in Cuba, and that, in those who had them, they were preexisting. Then, as the hypotheses on the case have changed, we have varied the course of our studies to see what we can find,” he explains.

And the current course, at least for Cubans and Canadians―allied in an investigation into strange conditions―points to the possible effect of pesticides used in Cuba in the frequent spraying of mosquitoes that transmit diseases such as dengue and Zika.
Is there a ”Havana Syndrome”? (OnCubaNews, March 6, 2020)
 
However, in this case the perpetrator appears to have an actual mental illness - and nevertheless to have been armed with an AK 47. Unlike the U.S. diplomats in Havana, he did not merely hear strange sounds but "voices in his head":

Alazo, who told investigators he was born in Cuba and served in the Cuban Army, had moved to Mexico in 2003 before claiming political asylum in the U.S. a few years later. He went back to Cuba in 2014 to preach at a church and began receiving threats from organized crime groups there, he told police.
Alazo, who had been living in his car and moving from state to state for several months, drove to Washington on Wednesday to target the Cuban Embassy “because he wanted to get them before they got him, referring to the Cuban government, for the constant threats from the organized Cuban criminal organization,” according to court papers.
Police believe Alazo had been sleeping at rest stops and in parking lots for at least nine months because he said he believed Cuban organized crime figures were after him and he wanted to protect his family.
Alazo told investigators that he had been treated at a psychiatric hospital and his wife, a nurse, had told him to seek treatment when he was hearing voices in his head, he said.
Accused embassy gunman said he feared Cuban organized crime (Federal News Network, May 1, 2020)


According to a friend of his, an Evangelical preacher in Miami, he is a paranoid schizophrenic:

Alazo fue descrito por un pastor evangélico del sur de la Florida con quien sostiene una cercana amistad, como alguien "obsesionado con la idea de que lo persiguen", motivado porque es una persona diagnosticada con esquizofrenia.
Ataque a embajada de Cuba en Washington continúa como enigma (Diario las Americas, May 1, 2020)


Miami-based TV station, with an anti-Castro bias, America TeVeCanal41:
Revelan detalles sobre Alexander Alazo, el hombre que disparó contra embajada de Cuba en Washington (May 1, 2020 – 21 min.)

(at 18:00 ff, the so-called 'Havana syndrome' is (still!) referred to as attacks on U.S. and Canadian diplomats and their families.)
 

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