Question

In: Advanced Math

Q) if a fraction λ of the population susceptible to a disease that provides immunity against...

Q) if a fraction λ of the population susceptible to a disease that provides immunity against reinfection moves out of the region of an epidemic, the situation may be modeled by system
S'=-βSI-λS
I'=βSI-α I.
Show that both S and I approach zero as t→∞.

Where,
S=The susceptible population
I=infected individuals
β=infection rate

Solutions

Expert Solution


Related Solutions

The Centers for Disease Control and Prevention (CDC) recommended against vaccinnating the whole population against the...
The Centers for Disease Control and Prevention (CDC) recommended against vaccinnating the whole population against the smallpox virus because the vaccination has undesirable, and sometimes fatal, side effects. Suppose that the accompanying table gives the data that are available about the effects of a smallpox vaccination program. Percent of population vaccinated Deaths Due to Small Pox Deaths due to vaccination side effects 0% 200 0 10% 180 4 20% 160 8 30% 140 12 40% 120 16 50% 100 20...
1. Why is herd immunity important to the general population and reducing infectious disease rates? 2....
1. Why is herd immunity important to the general population and reducing infectious disease rates? 2. What are the implications of nonscientists leading conversations that convince people to question the majority of the scientific community? 3. Should the government and media squelch the noise and stifle the nonsense, or do we simply chalk it up to First Amendment rights - free speech - even if that spreads disease? 4. Should the government make vaccinations mandatory? Is the state justified in...
Suppose it is known that the probability of being susceptible to contract a seasonal flu disease...
Suppose it is known that the probability of being susceptible to contract a seasonal flu disease in a town is 0.20. A bio-statistician randomly selected 12 unrelated people from the town and examined if they are susceptible to the disease. Considering upto 4 decimal places, find the following: (a) expected number of susceptible individuals; (b) probability that 2 or fewer susceptible individuals; (c) probability that exactly 3 susceptible individuals; (d) probability that at least 4 susceptible individuals.
If a person were to refuse vaccinations, and therefore transmit a deadly disease to a susceptible...
If a person were to refuse vaccinations, and therefore transmit a deadly disease to a susceptible person such as a young infant, should the unvaccinated person be criminally prosecuted? Why or why not?
3. Acquired lmmunity A) Discuss immunity acquired by vaccination B) Discuss immunity acquired by disease exposure...
3. Acquired lmmunity A) Discuss immunity acquired by vaccination B) Discuss immunity acquired by disease exposure C) Discuss. Acquired immunity Deficiency syndrome D) Discuss the function of T-Cells
Consider a disease with an exposed class that is also infectious. Individuals move from the susceptible...
Consider a disease with an exposed class that is also infectious. Individuals move from the susceptible to the exposed class at rate βSI + αSE, where β is the transmission rate of the I class and α is the transmission rate of the E class. Individuals from the E class move into the I class at rate δE. Individuals in the I class recover at rate γI. We will assume that removed individuals are immune and that the total population...
2. Immunity A) Discuss innate immunity B) Discuss ONE SPECIFIC autoimmune disease C) Discuss blood agglutination...
2. Immunity A) Discuss innate immunity B) Discuss ONE SPECIFIC autoimmune disease C) Discuss blood agglutination D) Discuss Rh lncompatibility in pregnancy
xplain how antibiotic resistance develops from a population of susceptible bacteria.
xplain how antibiotic resistance develops from a population of susceptible bacteria.
Suppose that a community contains 15,000 people who are susceptible to a contagious disease. If N(t)...
Suppose that a community contains 15,000 people who are susceptible to a contagious disease. If N(t) represents the number of people who have become infected in thousands, where t is time in days, and N′(t) is proportional to the product of the numbers of those who have caught the disease and of those who have not. The following logistic model can be used to model the spread of the disease. dN/dt= 1N(15−N) dt 100 (a) Sketch the phase line (portrait)...
The prevalence of a disease is the fraction of individuals who are afflicted, i.e., the ratio...
The prevalence of a disease is the fraction of individuals who are afflicted, i.e., the ratio of the number of cases to the whole population. The incidence of a disease is the fraction of individuals who become infected in one time period, usually one year. This terminology is usually reserved for chronic diseases such as diabetes or AIDS or cardiovascular disease, not for seasonal flu or coronavirus. The prevalence is equal to the incidence times the mean survival time. Thus...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT