Biosecurity and Infectious Diseases

Lord Trees Excerpts

Thursday 18th January 2024 Lords Chamber

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[Lord Trees]

That this House takes note of biosecurity, and the threat of infectious diseases for human, animal and plant health, in an age of globalisation and climate change.

[Lord Trees (CB)]

My Lords, after that I think I had better get a move on. First, it is a pleasure to welcome the Minister to the House and his new role; I wish him well and look forward to working with him. This is a major topic, so it is something of a baptism, but I hope fire will not be involved. I also thank all those who put their names down to speak; I am very grateful indeed. Finally, I draw attention to my declarations in the register.

In 1624, when John Donne wrote

“No man is an island …


Every man is …

A part of the main”,

he could not have imagined how prophetic that might be—although perhaps not in the way he intended. The movement of humans, animals and plants, and of animal and plant products, is now at a speed and scale that John Donne could not have imagined. We now exist in a global village, potentially shared with global pathogens. In 2001, the then director-general of the WHO, Gro Brundtland, commented rather less poetically than John Donne that

“with globalization, a single microbial sea washes all of humankind”.

Of course, the same is true for animals and plants.

This debate has a very broad scope, including human, animal and plant infections, and that is deliberate, in view of the interrelatedness of many of the issues, as recognised in the One Health concept. This debate is about biosecurity in the United Kingdom, so it concerns the threat of geographic spread of pathogens and pests to the UK and also of their potential establishment in the UK. The former can be very serious, even without the possibility of the latter, but if both conditions are met—spread, incursion and sustained transmission, as in Covid-19, foot and mouth and ash dieback—the consequences can be catastrophic.

Climate change is one driver of changes in infectious disease geography. A major recent review concluded that over half of infectious diseases of humans can be aggravated by climatic hazards. This is particularly relevant not only to the spread of pathogens but to their establishment as transmitted infections in new locations if vectors such as insects and ticks are involved.

While some pathogens are spread by the movement of free-living wildlife or invertebrate vectors such as insects, most human, animal and plant pathogens are spread by human-mediated transport, which means that they can travel vast distances in very short times—frequently shorter than the time it takes for their signs and symptoms to become apparent, which is very significant. The scale of global movements is now huge. In 2022, 224 million passengers passed through UK airports. In 2021, we imported food from 161 of the 195 recognised countries in the world. In 2022, we imported 18.6 million forest trees. Animal products can be in the UK in less than 12 hours from countries such as Mexico or Thailand.

A good example of the effect of host movement and infection spread to the UK is with respect to dogs and dog pathogens since the abolition of quarantine for rabies control and its replacement with rabies vaccination in 2000. This has had the effect of vastly increasing the number of dogs coming into the UK every year from around 5,000, which had previously spent six months in quarantine, to now in excess of 300,000 arriving within a matter of hours. We are fortunate that this has not yet resulted in any epidemic disease in dogs, but we have seen an accumulation of novel, previously exotic infections in our UK dog population. The latest of these is Brucella canis, a bacterial infection that is transmissible dog to dog but is also zoonotic—that is, transmissible to humans—which is a matter of particular concern.

With regard to plants, the effect of imported tree pathogens has been particularly devastating. A whole generation of British children has grown up who have not seen a full-grown elm tree, as a result of the ravages of Dutch elm disease, imported with elm products from Canada in the 1960s. This has been followed by the import of ash dieback disease affecting ash trees, which it has been estimated will cost us something like £15 billion to clean up and deal with.

Finally, with regard to human health, a number of infections are regularly reported in immigrant communities, such as malaria and TB, which fortunately do not spread easily in the UK, but some infections, of course, particularly respiratory viruses such as the virus causing Covid-19 and flu viruses, can spread rapidly from travellers to the resident population, with devastating consequences.

What of current threats? With apologies to Donald Rumsfeld, there are infections we have had in the past and might have again in the future, such as foot and mouth disease, which might be regarded as the known knowns. There are also infections that we have not experienced in the UK but which we are aware of and recognise that they present a new threat. African swine fever in pigs is a good animal example—perhaps a known unknown. Of course, there are unknown unknowns: infections yet to emerge from wildlife or plants, or newly evolved drug-resistant pathogens, escapees from laboratory research or creations of bioterrorism.

In humans, a major disease risk yet to reach the UK is the mosquito-transmitted dengue fever virus. This has spread north and west in continental Europe—from eight to 13 countries just in the last 10 years—and has caused locally acquired infections in the Paris region: as close to the UK as that. Transmission in the UK would require its mosquito vector to be established, but conditions are already favourable in the south—for example, around London.

In animals, avian influenza is a major current problem. That presents particular biosecurity challenges since it is introduced into our domestic and wild bird populations by migrating birds. African swine fever, which I have already mentioned, is a disease that has been expanding its range in continental Europe. It is carried by wild boars and causes serious disease in domestic pigs. It survives in meat products for many weeks, or even months, so there is a very real threat of its introduction to the UK through the 1 million tonnes of pigmeat we import annually, the vast majority of which comes from Europe.

In plants, our ambitious goals for the reforestation of the UK, which include planting 30,000 hectares of new woodland annually, are threatened by a host of tree pathogens that could spread to the UK. We risk losing more trees than we can possibly plant. For example, in 2020-21, more than 1,300 hectares of larch trees had to be felled in Wales to control a pathogen causing severe larch dieback. That was more than twice the area of new larch tree planting that year.

What is being done about these risks? The Government are to be congratulated on publishing the UK Biological Security Strategy in 2023. What progress has been made in enacting the commitments made by the Deputy Prime Minister, Oliver Dowden, in the other place in June 2023? Other developments have included the replacement of Public Health England with the UK Health Security Agency. A number of other different organisations and academic groups have been established or have evolved in response to biosecurity challenges. Time forbids me to mention these in detail.

Ironically, while, after Brexit, we now have the legal ability to regulate importations from continental Europe, we have not yet fully used those powers, although our proximity to Europe and our still substantial trade links mean that it is a likely source of a number of animal and plant pathogens. For example, there has been a recent outbreak of antibiotic-resistant salmonella in humans in the UK as a result of the importation of infected poultry products from Poland. This emphasises the importance of the new import inspection capability—the so-called border target operating model, or BTOM, which has been much delayed. Can the Minister say when BTOM will be working at full capability and with adequate human resources, especially of veterinary surgeons?

Given the scale of the surveillance challenge regarding imported goods or the movement of live humans, animals and plants into the UK, it will be essential to harness and further develop modern technologies for detecting pathogens and identifying high-risk situations. What are His Majesty’s Government doing to support and encourage research and development of high-throughput, high-technology biosurveillance tools to provide a metaphorical biosurveillance door through which all risk items pass?

Another important element is raising awareness—in the public, as well as in industry and commerce—of the challenges of biosecurity and, where relevant, the importance of travel vaccination. In 2018, the House of Lords EU Committee produced a report on the effects of Brexit on biosecurity in animals and plants. It highlighted the example of Australia and New Zealand, which have a highly effective biosecurity arrangement achieved through both legislation and public awareness. Can the Minister highlight what His Majesty’s Government are doing to increase public awareness of biosecurity threats?

While globalisation has brought great economic benefit, there is a cost to it—namely, the almost inevitable financial catastrophes from breaching our biosecurity, some of which I have outlined. These events can severely affect other attempts to improve human, animal or plant health, improve the environment and enhance biodiversity. We are spending millions in taxpayers’ money coping with the catastrophic impacts of imported diseases once they arise. Should we not be investing more in measures to try to prevent those happening? A major recent review of the costs of the global Covid-19 pandemic, and of global measures which might help prevent or reduce the inevitability of further pandemics, concluded that the associated costs of pandemic prevention and response efforts would, for 10 years, be only about 2% of the total cost of the global Covid-19 pandemic—estimated at between $8 trillion and $15 trillion.

Given that trade is a vector for pathogen transfer, on the same principle as for the environment where the polluter pays, should not those who benefit financially from trade have to bear some responsibility when biosecurity is breached? The EU Committee report of 2018 commented that the facilitation of trade post Brexit must not be allowed to compromise the UK’s biosecurity—a matter of considerable and continuing concern.

In conclusion, there is no doubt that there are very significant risks to the UK’s health security for humans, animals, plants and indeed the environment, and plenty of evidence that these risks are increasing because of climate change and globalisation. Although it may be difficult—indeed financially, practically and politically impossible—for us to prevent the emergence of infectious disease threats in other parts of the world, we do have the ability to try to reduce the risks of incursions of infectious diseases into the UK while allowing, as far as possible, unhindered trade. Just as we are increasingly recognising the importance of energy security and food security—the latter of which may be imperilled by the introduction of new animal and plant pathogens—I suggest we should equally recognise the importance of biosecurity.

--- Later in debate ---

[Lord Trees (CB)]

My Lords, I am conscious of time constraints, particularly after the remarks of the Leader of the House, so I will not say as much as usual and will be constrained in what I say with regard to the Minister having given his maiden speech. One usually says rather more, but we met for the first time only last night and I hope he will forgive me. I am grateful for his willingness to meet, and I very much look forward to working with him. With a background as a farmer and keeping sheep, he will know all about diseases, parasites and other useful things, and his knowledge of wildlife, conservation, food production and land management will be great assets in his role. I am delighted to note that he has a vet in the family, which I am sure will help.

I thank all the speakers. I never cease to be surprised and impressed, although I should not be, by how, without connivance, so many different facets are raised in debates in this Chamber. People bring different views on a subject and they are always articulated eloquently and with great knowledge. There is some repetition but, as several speakers mentioned, repetition has its place and virtues, and can do some good. I hope that we have helped raise the profile of this important subject. It was gratifying that there were so many speakers, which is testimony to the importance of biosecurity in all its facets. I am pleased that my good friend, our convenor, the noble Earl, Lord Kinnoull, managed to get his grey squirrels into the debate. The only thing left to do is to agree the Motion.

Motion agreed.