Down a dusty farm track in Chilean wine country, behind a wooden gate wrapped in chains, forestry experts are nursing a plantation of saplings whose bark holds the promise of potent vaccines.
Quillay trees, technically known as Quillaja saponaria, are rare evergreens native to Chile that have long been used by the indigenous Mapuche people to make soap and medicine. In the past few years, they have also been used to make a highly successful vaccine against shingles and the world’s first malaria vaccine, as well as foaming agents for products in the food, beverage and mining industries.
Now two saponin molecules, made from the bark of branches pruned from older trees in Chile’s forests, are being used for a COVID-19 vaccine developed by drugmaker Novavax Inc. The chemicals are used to make an adjuvant that reportedly boosts the immune system.
Over the next two years, Maryland-based Novavax plans to produce billions of doses of the vaccine, mostly for low and middle-income countries, which would make it one of the largest COVID-19 vaccine suppliers in the world.
With no reliable data on how many healthy quillay trees are left in Chile, experts and industry officials are divided on how quickly the supply of older trees could be depleted by rising demand.
However, nearly everyone agrees that industries relying on quillay extracts would at some point need to switch to trees grown in plantations or a lab-grown alternative.
A Reuters analysis of export data from trade data provider ImportGenius showed that the supply of older trees is under increasing pressure. Exports of quillay products more than tripled to more than 3,600 tonnes per year in the decade before the COVID-19 pandemic.
Ricardo San Martin, who developed the pruning and extraction process that created the modern quillay industry, said that producers must immediately work toward making quillay products from younger, plantation-grown trees.
“My estimate four years ago was that we were heading toward the sustainability limit,” he said.
San Martin said he has toiled through the pandemic in the basement of his oceanfront cabin in Sea Ranch, California, to refine a process that could help produce saponins from leaves and twigs to maximize the yield.
“I am working as though this needs to be done yesterday,” said San Martin, who is also sponsoring a project in which drones would count quillay trees in remote and hard-to-access forests, to determine how many are left.
Quillay producers and their customers say the harvest can continue for now without decimating the supply of older trees.
“We continue to monitor the situation in Chile, in close collaboration with our supplier, but at this time we are confident in our supply,” Novavax said in a statement.
The company also said it was confident that uses such as “life-saving vaccines will be prioritized.”
The desert-plant extract company Desert King International Ltd, which runs the Casablanca plantation, is Novavax’s sole supplier of quillay extracts and Chile’s largest quillay exporter by far.
Desert King general manager of Chile and natural response Andres Gonzalez said it is set to produce enough quillay extract from older trees to make up to 4.4 billion vaccine doses next year.
With new supplies from privately owned native forests, they have enough raw material to meet demand for the rest of this year and part of the next, he said.
Gonzalez said the company, where San Martin is a consultant, has built a new production plant and has the capacity to supply other interested pharmaceutical firms — all without harming the forests.
However, he said that “at some point these native forests will come to an end.”
“We want to start having very productive plantations, and we are working on that,” he said.
A relatively small volume of quillay extract is required to make vaccines — just under 1mg per dose — but the supply is stretched by the demand from other industries. Quillay products are used, for instance, as a natural additive in animal feed, a biopesticide and an agent to reduce pollution in mining.
Individual quillay trees grow outside of Chile, but Chile is the only country where mature quillay is harvested from forests in large quantities.
Novavax’s adjuvant, known as Matrix-M, contains two key saponin molecules. One of those, called QS-21, is more difficult to access because it is found mainly in trees that are at least 10 years old.
Among major pharmaceutical companies, only GlaxoSmithKline PLC and Novavax have bet heavily on QS-21, a relatively new pharmaceutical ingredient.
GSK’s highly successful vaccine against shingles, Shingrix, and several other promising experimental vaccines contain QS-21 supplied by Desert King.
In a statement, GSK said it has “no specific challenges relating to sustainable supply” of QS-21.
The quillay-based adjuvant used in Shingrix is also part of the world’s first malaria vaccine, Mosquirix.
The WHO on Wednesday said that it should be widely given to African children, marking what could be a major advance against malaria.
No other COVID-19 vaccine manufacturers are relying on quillay bark extracts. Some drugmakers are developing synthetic alternatives, but these could be years from regulatory approval. Switching out the ingredients in any existing vaccine would require new clinical studies to prove the product is safe and effective.
The Massachusetts-based pharmaceutical company Agenus stopped selling bark-derived QS-21 several years ago to focus full-time on trying to grow it from quillay plant cells in a laboratory.
“The shortage of QS-21 has been an issue for a while,” Agenus vice president of strategic initiatives and growth exploration Jason Paragas said. “We saw it before COVID, and we made the hard decision that we had to change.”
Paragas said it is too soon to say when an alternative could be ready.
Entrepreneur Gaston Salinas said his Davis, California-based start-up Botanical Solution Inc can already produce QS-21 from quillay tissue starting with seeds in the lab, and aims to eventually produce the chemical on a large scale to supply pharmaceutical companies.
“You cannot afford to over-exploit the native Chilean forest because of a desire to develop modern vaccines. You need to find other ways to develop your products, even if it’s something so important,” he said.
Inside the gate of the carefully guarded Desert King plantation, gardeners carefully tend to the young trees using fertilizers and bountiful supplies of water. They were cloned from full-grown cousins whose dusty gray bark is especially rich in saponins.
If all goes well, the plantation could be producing for one customer in two to three years, Desert King business development manager Damian Hiley said.
He declined to name the company.
Desert King has its eye on future vaccines, some already in the works.
In early 2020, for instance, GSK licensed an experimental tuberculosis vaccine that contains GSK’s QS-21-based adjuvant to the Bill and Melinda Gates Medical Research Institute. It showed promising results in a mid-stage trial.
In April, researchers at Oxford University announced that a new malaria vaccine containing Novavax’s Matrix-M adjuvant appeared to be highly effective in a trial involving 450 children in Burkina Faso.
Gustavo Cruz, a researcher at the University of Chile who worked with San Martin to industrialize production of quillay, said he generally trusts quillay producers to manage supply and demand. He is more worried about other threats — specifically drought and fire.
“The trees do eventually regrow, but there comes a time when they don’t anymore,” he said.
Production at Taiwan Semiconductor Manufacturing Corp’s (TSMC, 台積電) fabs was not affected by a fire at a construction site for a water recycling facility in the Southern Taiwan Science Park in Tainan. The world’s biggest contract chipmaker said that the construction site is not adjacent to its fabs, which were unaffected. CTCI Corp (中鼎工程) is responsible for the construction of the facility, which it is to operate itself once it is completed, the chipmaker said. The facility caught fire at about 11am, and the blaze was brought under control about 30 minutes after the incident was reported, the Southern Taiwan Science Park Administration
SUBSIDIES NEEDED: Legislation to provide grants and incentives to the semiconductor industry has been stalled by lawmakers, to the frustration of chipmaker Intel Corp’s plans for a multibillion-dollar investment in a new US semiconductor plant hang in part on the US Congress moving on a stalled plan to bolster the domestic chip industry, Intel CEO Pat Gelsinger said. “The capital plans that we’ve laid out do not presume anything heroic on the part of the government, but we’d like to go bigger and faster as a result of the investments from the US government,” Gelsinger said on Bloomberg Television. Intel’s earnings report on Thursday underscored the costs of returning the world’s largest chipmaker to global industry leadership. A bipartisan push to make the US more
Taiwan Semiconductor Manufacturing Co (TSMC, 台積電), the world’s largest contract chipmaker, yesterday denied a report that there has been a delay in its Arizona investment project, saying the plan is on schedule. Construction of a planned 12-inch wafer foundry in Arizona started in June and equipment installation is to start in the second half of next year, TSMC said. In the fab’s initial phase, it is to produce 20,000 wafers a month starting in the first quarter of 2024, the company said. TSMC announced the Arizona project in May last year, saying it would invest US$12 billion to build the fab, which would
GOOGLE’S PHONES: The new devices include the firm’s Titan M2 security chip, tasked with handling jobs such as passcode protection, encryption and transactions Google on Tuesday launched the latest Pixel smartphones, betting on its first custom-designed system processor and a new version of the Android operating system to lure buyers away from Apple Inc’s iPhone. The Pixel 6 and 6 Pro differ only slightly in size, memory and camera specs, with both built around Google’s Tensor system-on-chip, a custom semiconductor that took four years of development. Tensor is optimized for Google’s strengths in image processing and artificial intelligence, helping deliver faster and more accurate speech recognition and better battery life. While Google’s Android is the top smartphone operating system globally, the Alphabet Inc unit has a