Tropical Diseases
Africa is breaking the grip of tropical diseases thanks to a coalition of aid agencies, pharmaceutical companies, and charities that formed Uniting to Combat Neglected Tropical Diseases (NTDS). Health programs in individual countries and radio programs where experts and patients answer questions about treatments and dispel misconceptions also do their part.
In Sierra Leone, for example, a country once ravished by Ebola, health workers visit villages once a year to provide everyone at risk with drugs for four diseases:
- Elephantiases (lymphatic filariasis). Microscopic worms infest the body and cause extreme irreversible swelling and damage.
- River blindness (onchocerciasis). Blindness caused by black fly bites and worms infecting the body.
- Snail fever (schistosomiasis). Parasitic worm infection that destroys kidneys and the liver.
- (Helminths) Roundworms in soil cause infections that stunt growth and physical development.
Mosquitoes continue to be the ones that transmit malaria, dengue fever, and Zika in tropical areas. In warm, wet weather, they mature faster and become infectious sooner. But even in warm, dry conditions, they find ways to survive underground in storm drains and sewers. In Singapore on a small scale, Trendwatching.com reports innovative pots, decorated with paint infused with the non-toxic mosquito repellent, permethrin, are used to kill mosquitoes trying to survive in water collected in plant pots. (Use keywords, mosquitoes, malaria, dengue, and Zika, to find earlier posts on these subjects.)
Polio
News that polio is staging a comeback in some parts of the world recalls disturbing memories from my childhood. Paralysis from polio required President Franklin Roosevelt to wear leg braces, a neighbor to live in an iron lung, and a playmate to compensate for her withered left arm. When Jonas Salk's polio vaccine became available in the 1960s, we all rushed to take it on sugar cubes.
Normally, the polio vaccine that carries a live, weakened virus breeds in the recipient's intestines and enters the bloodstream to cause a lifelong protective immune response. But occasionally, once in every 17 million vaccinations, the weakened virus mutates and causes a new strain that can live in poop for six to eight weeks following an innoculation. In countries that lack clean water, adequate toilets, and treatment for sewage, polio is transmitted by drinking water carrying the mutated virus. That seems to be what has happened to cause cases of polio in Papua New Guinea, Afghanistan, Pakistan, and Nigeria.
HIV/AIDS and STDs
Ever since the International AIDS Society (IAS) established a 90-90-90 goal in 2014, countries have aimed to make sure 90% of their population knows they have the disease, 90% of those are taking antiretroviral drugs (ARVs), and virus levels in 90% taking ARVs are negligible. Worldwide, only a 75-79-81 goal is reached.
In less developed countries, HIV is combated by circumcising male foreskins to remove HIV-breeding cells and by paying school tuition for girls who are less susceptible to exchanging sex for food and other benefits, if they have employable skills. In all countries, HIV prevention responds to a combination of two ARVs, tenofovir and emtricitabine found in Truvada. Prevention still depends on those at risk coming forward and governments willing to help pay for treatment.
After being raised and educated in Europe, Dr. Agnes Binagwano began returning to Rwanda with suitcases filled with medical supplies. Working with the government, she began an HIV program and trained health workers to visit villagers in their homes. To build trust for Rwanda's health care program, villagers chose the health workers who care for them.Once the country with the worst child mortality rate, 97% of Rwanda's infants now are vaccinated. The country where genocide killed nearly one million in 1994 also has the University of Global Health Equity in Kigali, rural health centers, and a nationwide health insurance program.
Still a problem, ARVs give gay and bisexual men a false impression that these drugs prevent all sexually transmitted diseases (STDs). And birth control pills and other forms of female contraception give heterosexual couples the false impression male partners need not use condoms. Consequently, syphilis, chlamydia, and gonorrhoea infections all are on the rise from unprotected sex. At the same time, testing has been hit by cuts in funding for preventive education, local health departments, and confidential clinics that cater to adolescents.
Gene Editing
Which human cells the CRISPR-Cas9 technique edits and the changes made promise to treat diseases when engineered cells return to a patient's body. While unintended consequences of CRISPR-Cas9 editing to improve agricultural crops are less of a concern, the studies that find some forms of CRISPR-Cas9 editing delete or rearrange strings of DNA, affect non-targeted genes, and might cause cancer in humans motivate the search for technological techniques that produce only intended results.
Genetic engineering capable of removing hereditary predispositions to cancer would, of course,be valuable. Editing into humans destructive hereditary traits passed along to future generations would not.
Based on the way viruses can penetrate bacteria cells and destroy their defenses, CRISPR editing also is involved in the search for a way to k(ll superbugs resistant to antibiotics. (Use the keywords, antibiotics and CRISPR, to see earlier posts on these subjects.)
Cellphone Radiation
Research continues to study the danger of cellphone radiation from phones and antennas. Emissions from decaying lithium batteries, which remind me of those from black holes, also seem to indicate possible health risks. Keep an eye on findings about brain damage and memory loss from long term studies of new 5G technology.
