Lunch Program │ An Update on Zika Virus With CDC Director Tom Frieden

Public Health Economic Impact and Historical Milestones

• Public health, medical research, and healthcare accountability account for 50% of all economic growth.
• Over 4 million years of evolution, average human life expectancy increased by only 11 years.
• In the last 114 years alone, average life expectancy has increased by 40 years.
• Polio cases in the United States peaked in 1952; by 1954, 2 million children enrolled in clinical trials for the Salk vaccine.
• The Salk vaccine was ruled effective on April 12, 1955, following the unprecedented recruitment of Elvis Presley to demonstrate safety.
• Since 1987, global partnerships have driven a reduction in the risk of pregnant women transmitting HIV to children from 90% to 2%.
• More than two-thirds of the global population living with AIDS resides in sub-Saharan Africa.
• Life expectancy in East Africa is projected to rise from 43 to 75 years within two generations, driving the region's economic potential.
• Sub-Saharan Africa is projected to account for 100% of the net increase in global population growth this century.
• Uganda's median age is currently 15, whereas China's median age is approaching that of the United States and growing faster than any country in history.

CDC Director Thomas Frieden: Zika Virus and Global Health Security

• Zika virus was first detected in a primate in Uganda in 1947 but was not known to cause human disease until the 1960s.
• The 2007 outbreak in Micronesia infected 73% of the 9,000-person population but resulted in no serious outcomes.
• Brazil reported a significant increase in microcephaly cases linked to Zika starting late last year; rubella was the only other pathogen identified as causing severe fetal malformation in over 50 years.
• The virus is primarily mosquito-borne by Aedes aegypti, which is resilient, bites multiple hosts, and also transmits dengue, chikungunya, and yellow fever.
• Zika persists in blood for approximately one week, posing a theoretical risk for transmission via blood transfusion.
• Unanticipated sexual transmission rates have increased, with CDC laboratories confirming 14 possible cases in the U.S. spread via non-travel sexual contact.
• Puerto Rico faces the highest U.S. risk, with 3.5 million people and 34,000 births annually; a Chikungunya-level spread could result in 700,000 infections and thousands of infected pregnant women.
• CDC laboratory teams have scaled up production to 375,000 PCR tests and 100,000 serology tests within a few weeks, a process historically requiring years.
• NIH leads vaccine development with guarded optimism; a vaccine may be available in a best-case scenario within a couple of years but is not guaranteed.
• Lessons from the Ebola crisis emphasize "known unknowns" regarding Zika and the critical necessity of speed in containing outbreaks before they escalate globally.
• The Global Health Security Agenda has established an accountability system with red/yellow/green scorecards to rate country preparedness for disease detection and response.
• Multi-drug resistant tuberculosis (MDR-TB) is driven by poorly performing control programs rather than inherent bacterial properties; hospitals can amplify spread if infection control is weak.
• Hypertension is the single most neglected problem globally, killing more people than tobacco, yet only 13-14% of the world population has their condition under control.
• In the U.S., only 52% of the population with hypertension has their condition controlled; successful regional models in Minnesota/St. Paul achieve 70% control rates.
• CDC Director Frieden identifies "winnable battles" including reducing tobacco use, addressing the iatrogenic epidemic of prescription opiate abuse, improving food safety, and reducing motor vehicle crashes.

Gene-Environment Interactions and Lifestyle Factors

• Identical twins do not share a 100% disease concordance rate; for common diseases like diabetes and stroke, the rate is 25% or lower, indicating significant non-genetic influence.
• Japanese migrants who moved to the U.S. experienced a tenfold increase in hormone-driven cancers compared to those who remained in Japan, driven by lifestyle and diet rather than genetics.
• Epigenetics explains gene expression changes triggered by environment; identical twins show increasing divergence in DNA methylation over time.
• Early-life exposures, such as maternal smoking, poor nutrition, or mercury exposure in utero, can trigger permanent epigenetic changes detectable in cord blood.
• The Dutch famine study demonstrated that severe malnutrition during pregnancy led to offspring with altered insulin receptor gene expression and higher rates of diabetes and cardiovascular disease.
• Chronic stress, particularly in neighborhoods with foreclosure, poverty, and segregation, elevates cortisol levels and increases the risk of preterm birth and growth retardation.
• Research by Professor Thomas LaVeist indicates that health disparities are driven by "place, not race," specifically regarding the stress of living in segregated environments.

Portion Size Trends and Public Perception

• The average serving size of soda has increased from 6.5 ounces in 1955 to 20 ounces today, a change occurring over just 60 years.
• U.S. portion sizes for soft drinks are 52% larger than in France; yogurt cartons are 82% larger; and hot dogs are 63% larger.
• Candy bars in the U.S. are 41% larger than comparable products in France, countering consumer assumptions about shrinking portions.
• A modern hamburger is significantly larger than the standard burger from the 1950s, contributing to rising obesity rates.